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		<title>passguide cisco ccnp 642-892 december 20th</title>
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		<pubDate>Tue, 22 Dec 2009 02:52:48 +0000</pubDate>
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		<description><![CDATA[Pass Your Cisco 642-892 Exam with Testking
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			<content:encoded><![CDATA[<p>Pass Your Cisco <a href="http://www.ccnp.cc/tag/642-892">642-892 Exam</a> with Testking</p>
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		<title>PassGuide ccnp 642-892 Composite pdf</title>
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		<pubDate>Sat, 12 Dec 2009 10:01:29 +0000</pubDate>
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		<description><![CDATA[642-892 Composite
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Associated Certifications:	CCNP, CCDP
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			<content:encoded><![CDATA[<p>642-892 Composite<br />
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   	Exam Number:	   	<a href="http://www.passguide.com/642-892.html">642-892 study</a><br />
Associated Certifications:	CCNP, CCDP<br />
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		<pubDate>Sat, 25 Oct 2008 12:58:10 +0000</pubDate>
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		<description><![CDATA[Pass4sure > Cisco > CCNP > Exam 642-892 
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<p>QUESTION 51<br />
Which one of the following commands would configure EIGRP for IP on your Cisco<br />
router? </p>
<p>A. ip eigrp routing<br />
B. router eigrp process-id<br />
C. ip eigrp autonomous-system-number<br />
D. router eigrp autonomous-system-number<br />
E. None of the above </p>
<p>Answer: D </p>
<p>Explanation:<br />
Perform the following steps to configure EIGRP for IP:<br />
Step 1 Enable EIGRP and define the autonomous system.<br />
routerCK(config)#router eigrp autonomous-system-number<br />
Step 2 Indicate which networks are part of the EIGRP autonomous system.<br />
routerCK(config-router)#network network-number<br />
Step 3 Define bandwidth of a link for the purposes of sending routing update traffic on<br />
the link.<br />
routerCK(config-if)#bandwidth kilobits. This step is optional. </p>
<p>The syntax for configuring variance on an EIGRP router is:<br />
variance number<br />
In the EIGRP command sequence above, what is the function of the number<br />
variable? </p>
<p>A. It acts as a multiplier.<br />
B. It defines the limit for how far the metrics can be separated.<br />
C. It indicates how many paths can be used for load balancing.<br />
D. It indicates how many paths can be used for unequal load balancing.<br />
E. None of the above </p>
<p>Answer: A </p>
<p>Explanation:<br />
Every routing protocol supports equal cost path load balancing. IGRP and EIGRP also<br />
support unequal cost path load balancing, which is known as variance. The variance<br />
number command instructs the router to include routes with a metric less than or equal to<br />
number times the minimum metric route for that destination. Thus number is used as<br />
multiplier, even though it defines a limit for the metrics. This limit is used for unequal<br />
load balancing.<br />
QUESTION 54<br />
You are the network engineer at Certkiller . You want to configure EIGRP to run<br />
across a 56 Kbps serial PPP link on the Certkiller network. You also want to ensure<br />
the proper convergence of EIGRP routes.<br />
What command should you issue on the serial interface? </p>
<p>A. bandwidth 56<br />
B. bandwidth 56000<br />
C. ip bandwidth-percent eigrp 1 56<br />
D. ip bandwidth-percent eigrp 1 56000<br />
E. None of the above </p>
<p>Answer: A </p>
<p>Explanation:<br />
The bandwidth is a logical construct whose value can have wide-reaching implications on<br />
the function of your network. It does not affect the actual speed of the link. In fact, it is<br />
practical to configure the bandwidth command only on serial lines, where the speed of<br />
the link will vary considerably. This command is useful for routing protocols that use<br />
bandwidth as part of the metric. For serial interfaces, this value defaults to a full T1, so it<br />
my appear to be a better link than what is actually being used.<br />
Router (config) # interface S0<br />
Router (config-if) # bandwidth speed-of-line<br />
The bandwidth command is always specified in kbps.<br />
EIGRP limits itself to 50 percent of the value specified in the<br />
bandwidth command, or if the bandwidth command is not set, the interface defaults. If<br />
you need to limit this percentage further, the upper limit that EIGRP uses can be stated as<br />
a percentage of the bandwidth command.<br />
The ip bandwidth-percent-eigrp command interacts with the bandwidth command on the<br />
interface. You would use this command primarily because in your network, the<br />
bandwidth command does not reflect the true speed of the link. The bandwidth command<br />
might have been altered to manipulate the routing metric and path selection of a routing<br />
protocol, such as IGRP or OSPF. It might be better to use other methods of controlling<br />
the routing metric and return the bandwidth to a true value. Otherwise, the ip<br />
bandwidth-percent eigrp command is available. It is possible to set a bandwidth percent<br />
that is larger than the stated bandwidth. This is with the understanding that, although the<br />
bandwidth might be stated to be 56 kbps, the link is in fact 256 kbps. The following<br />
shows the structure of the ip bandwidth-percent eigrp command:<br />
Router (config) #interface S0<br />
Router (config-if) #ip bandwidth-percent eigrp autonomous-system-number percent </p>
<p>QUESTION 58<br />
Your network consists of a router named R1 that&#8217;s configured<br />
in a hub and spoke topology, supporting 24 remote office via a point-to-multipoint<br />
Frame Relay EIGRP network deployment. The bandwidth command was not<br />
manually entered on the frame relay main interface or the sub-interfaces. What is<br />
the perceived bandwidth (as seen by the EIGRP process) of each Frame Relay<br />
connection? </p>
<p>A. 64 kbps<br />
B. 128 kbps<br />
C. 1.544 Mbps<br />
D. 1.536 Mbps<br />
E. None of the above </p>
<p>Answer: A </p>
<p>Explanation:<br />
The default bandwidth for all serial WAN interfaces is 1.544 Mbps. EIGRP by default<br />
assumes the bandwidth of a serial interface is a full T1 (1.544 Mbps) if not specified.<br />
This includes sub-interfaces. For multipoint frame relay interfaces, the perceived<br />
bandwidth used by the IOS is taken from the configured bandwidth, divided by the<br />
number of configured neighbors. Since there are 24 remote offices, there are 24<br />
configured frame relay neighbors, so the bandwidth used by the IOS is the full T1<br />
divided by 24, which is 64kbps. </p>
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		<pubDate>Wed, 13 Aug 2008 14:16:04 +0000</pubDate>
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		<description><![CDATA[testinside Cisco  ccnp 642-892 Exam
Practice Exam 642-892
Product Description:
Exam Number/Code: 642-892
Exam Name: CCNP CCDP
&#8220;CCNP CCDP &#8217;s Composite Exam&#8221;, also known as 642-892 exam, is a Cisco certification.
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<p>1. What action should a network administrator take to enable VTP pruning on an entire management domain?<br />
A. enable VTP pruning on any client switch in the domain<br />
B. enable VTP pruning on every switch in the domain<br />
C. enable VTP pruning on any switch in the management domain<br />
D. enable VTP pruning on a VTP server in the management domain<br />
Answer:D</p>
<p>2. How does VTP pruning enhance network bandwidth?<br />
A. by restricting unicast traffic to across VTP domains<br />
B. by reducing unnecessary flooding of traffic to inactive VLANs<br />
C. by limiting the spreading of VLAN information<br />
D. by disabling periodic VTP updates<br />
Answer:B</p>
<p>3. In the hardware address 0000.0c07.ac0a what does 07.ac represent?<br />
A. vendor code<br />
B. HSRP group number<br />
C. HSRP router number<br />
D. HSRP well-known physical MAC address<br />
E. HSRP well-known virtual MAC address<br />
Answer:E<br />
4. When building an IP multicast domain using PIM which mode assumes that other routers do not want to<br />
forward multicast packets for the group?<br />
A. PIM-DM<br />
B. PIM-SM<br />
C. PIM-RP<br />
D. CGMP<br />
E. IGMP snooping<br />
Answer:B</p>
<p>5. Which statement describes Dynamic Trunking Protocol (DTP) mode &#8216;desirable&#8217;?<br />
A. The interface is put into permanent trunking mode and negotiates to convert the link into a trunk link.<br />
B. The interface actively attempts to convert the link to a trunk link.<br />
C. The interface is put into permanent trunking mode but prevented from generating DTP frames.<br />
D. The interface is put into a passive mode, waiting to convert the link to a trunk link.<br />
Answer:B</p>
<p>6. Which three statements are correct with regard to the IEEE 802.1Q standard? (Choose three.)<br />
A. the packet is encapsulated with a 26 byte header and a 4 byte FCS<br />
B. the IEEE 802.1Q frame format adds a 4 byte field to a Ethernet frame<br />
C. the IEEE 802.1Q frame retains the original MAC destination address<br />
D. the IEEE 802.1Q frame uses multicast destination of 0&#215;01-00-0c-00-00<br />
E. protocol uses point-to-point connectivity<br />
F. protocol uses point-to-multipoint connectivity</p>
<p>Answer:BCE</p>
<p>7. In a customer&#8217;s network, VLAN Trunking Protocol (VTP) is running with a domain named main1. VLANs<br />
1,2,3,4,5,10,20 are active on the network. Suddenly the whole network goes down. No traffic is being passed on<br />
VLANs 2,3,4,5,10,20, however traffic passes on VLAN 1 and indicates all switches are operational. Right before<br />
the network problem occurred, a switch named TEST1 was added to the network. What three configuration issues<br />
on TEST1 could be causing the network outage? (Choose three.)<br />
A. TEST1 is configured as a VTP server with a different domain name.<br />
B. TEST1 is not configured to participate in VTP.<br />
C. TEST1 is configured as a VTP server with the domain name main1.<br />
D. TEST1 has a lower VTP configuration revision than the current VTP revision.<br />
E. TEST1 has a higher VTP configuration revision than the current VTP revision.<br />
F. TEST1 is configured with only VLAN1.<br />
Answer:CEF</p>
<p>8. What is correct about the BGP synchronization command? (Choose two.)<br />
A. Synchronization must be enabled when implementing a multi-homed BGP connection to multiple ISPs.</p>
<p>B. If it is turned ON, a prefix learned from IBGP neighbor is valid only if a non-bgp (IGP) route exists for that<br />
prefix.<br />
C. Synchronization is necessary when peering with an EBGP neighbor.<br />
D. Synchronization improves BGP routing convergence.<br />
E. Synchronization can be turned off if all the transit routers in an Autonomous system running full mesh IBGP.<br />
Answer:BE</p>
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		<description><![CDATA[testking Cisco ccnp  642-892 Exam
Questions &#38; Answers 642-892 &#8211; Questions &#38; Answers
Interactive Testing Engine Included!
1008 Questions
Updated : 08/06/2008
New testking 642-892 exam
QUESTION 1
Chinatag uses EIGRP as the primary routing protocol in their network. How does
EIGRP advertise subnet masks for each destination network?
A. EIGRP advertises a fixed length subnet mask for each destination network.
B. EIGRP advertises [...]]]></description>
			<content:encoded><![CDATA[<p>testking Cisco ccnp  642-892 Exam<span id="more-13"></span><br />
Questions &amp; Answers <a href="http://www.ccnp.cc/tag/642-892">642-892</a> &#8211; Questions &amp; Answers<br />
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1008 Questions<br />
Updated : 08/06/2008</p>
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QUESTION 1<br />
Chinatag uses EIGRP as the primary routing protocol in their network. How does<br />
EIGRP advertise subnet masks for each destination network?<br />
A. EIGRP advertises a fixed length subnet mask for each destination network.<br />
B. EIGRP advertises only a classful subnet mask for each destination network.<br />
C. EIGRP, like IGRP and RIP, does not advertise a subnet mask for each destination<br />
network.<br />
D. EIGRP advertises a prefix length for each destination network.<br />
E. None of the above<br />
Answer: D<br />
Explanation:<br />
Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco-proprietary routing<br />
protocol based on IGRP. Unlike IGRP, which is a classful routing protocol, EIGRP supports<br />
CIDR, allowing network designers to maximize address space by using CIDR and VLSM.<br />
Compared to IGRP, EIGRP boasts faster convergence times, improved scalability, and<br />
superior handling of routing loops.<br />
The prefix length field signifies the subnet mask to be associated with the network<br />
number specified in the destination field. Thus, if an EIGRP router is configured as<br />
follows:<br />
Thank you very much for your product Cisco 642-892 Composite, Q&amp;A with explanations. I&#8217;ve passed the Exam on last Friday.<br />
1. ip address 172.16.1.1 255.255.255.0<br />
it will advertise 172.16.1.0 with a prefix length of 24.<br />
Likewise, if the router is configured as follows:<br />
1. ip address 172.16.250.1 255.255.255.252<br />
it will advertise 172.16.250.0 with a prefix length of 30.<br />
QUESTION 2<br />
The Chinatag network uses EIGRP. Identify three characteristics of EIGRP feasible<br />
successors? (Select three)<br />
A. Traffic will be load balanced between feasible successors with the same advertised<br />
distance.<br />
B. If the advertised distance of the non-successor route is less than the feasible distance of<br />
best route, then that route is identified as a feasible successor.<br />
C. If the successor becomes unavailable, then the feasible successor can be used immediately<br />
without recalculating for a lost route.<br />
D. The feasible successor can be found in the routing table.<br />
E. A feasible successor is selected by comparing the advertised distance of a<br />
non-successor route to the feasible distance of the best route.<br />
Answer: B, C, E<br />
Explanation:<br />
Once a neighbor relationship has been formed, called an Adjacency, the routers exchange<br />
routing update information and each router builds its own topology table. The Updates contain<br />
all the routes known by the sender. For each route, the receiving router calculates a distance for<br />
that route based on the distance that is conveyed and the cost to that neighbor that advertised<br />
the particular route. If the receiving router sees several routes to a particular network with<br />
different metrics, then the route with the lowest metric becomes the Feasible Distance (FD) to<br />
that network. The Feasible Distance is the metric of a network advertised by the connected<br />
neighbor plus the cost of reaching that neighbor. This path with the best metric is entered into<br />
the routing table because this is the quickest way to get to that network.<br />
With the other possible routes to a particular network with larger metrics, the receiving router<br />
also receives the Reported Distance (RD) to this network via other routers. The Reported<br />
Distance being the total metric along a path to a destination network as advertised by an<br />
upstream neighbor. The Reported Distance for a particular route is compared with the Feasible<br />
Distance that it already has for that route. If the Reported Distance is larger than the Feasible<br />
Distance then this route is not entered into the Topology Table as a Feasible Successor. This<br />
prevents loops from occurring. If the Reported Distance is smaller than the Feasible Distance,<br />
then this path is considered to be a Feasible Successor and is entered into the Topology table.<br />
The Successor for a particular route is the neighbor/peer with the lowest metric/distance to that<br />
network.<br />
If the receiving router has a Feasible Distance to a particular network and it receives an update<br />
from a neighbor with a lower advertised distance (Reported Distance) to that network, then<br />
there is a Feasibility Condition. In this instance, the neighbor becomes a Feasible Successor for<br />
that route because it is one hop closer to the destination network. There may be a number of<br />
Feasible Successors in a meshed network environment, up to 6 of them are entered into the<br />
Topology table thereby giving a number of next hop choices for the local router should the<br />
neighbor with the lowest metric fail. What you should note here, is that the metric for a<br />
neighbor to reach a particular network (i.e. the Reported Distance) must always be less than the<br />
metric (Feasible Distance) for the local router to reach that same network. This way routing<br />
loops are avoided. This is why routes that have Reported Distances larger than the Feasible<br />
Distance are not entered into the Topology table, so that they can never be considered as<br />
successors, since the route is likely to loop back through that local router.<br />
Incorrect Answers:<br />
D: The feasible successors are found in the topology table, but not the active routing table.<br />
E: With EIGRP, traffic is load balanced across equal cost links in the routing table, but not<br />
between feasible successors.<br />
Reference: http://www.rhyshaden.com/eigrp.htm<br />
QUESTION 3<br />
Two Chinatag EIGRP routers are attempting to establish themselves as neighbors.<br />
Which EIGRP multicast packet type is responsible for neighbor discovery?<br />
A. Update<br />
B. Query<br />
C. Acknowledgment<br />
D. Reply<br />
E. Hello<br />
F. None of the above<br />
Answer: E<br />
Explanation:<br />
Remember that simple distance vector routers do not establish any relationship with their<br />
neighbors. RIP and IGRP routers merely broadcast or multicast updates on configured<br />
interfaces. In contrast, EIGRP routers actively establish relationships with their neighbors,<br />
much the same way that OSPF routers do.<br />
EIGRP routers establish adjacencies with neighbor routers by using small hello packets. Hellos<br />
are sent by default every five seconds. An EIGRP router assumes that as long as it is receiving<br />
hello packets from known neighbors, those neighbors (and their routes) remain viable. By<br />
forming adjacencies, EIGRP routers do the following:<br />
1. Dynamically learn of new routes that join their network<br />
2. Identify routers that become either unreachable or inoperable<br />
3. Rediscover routers that had previously been unreachable<br />
QUESTION 4<br />
Chinatag has chosen to use EIGRP for their network routing protocol. Which three<br />
statements are true regarding EIGRP? (Select three)<br />
A. By default, EIGRP uses the Dijkstra algorithm to determine the best path to a<br />
destination network based on bandwidth and delay.<br />
B. To speed convergence, EIGRP attempts to maintain a successor and feasible successor path<br />
for each destination.<br />
C. EIGRP uses hellos to establish neighbor relationships.<br />
D. By default, EIGRP performs auto-summarization across classful network boundaries.<br />
E. EIGRP uses an area hierarchy to increase network scalability.<br />
Answer: B, C, D<br />
Explanation:<br />
EIGRP routers establish adjacencies with neighbor routers by using small hello packets. Hellos<br />
are sent by default every five seconds. An EIGRP router assumes that as long as it is receiving<br />
hello packets from known neighbors, those neighbors (and their routes) remain viable. By<br />
forming adjacencies, EIGRP routers do the following:<br />
1. Dynamically learn of new routes that join their network<br />
2. Identify routers that become either unreachable or inoperable<br />
3. Rediscover routers that had previously been unreachable<br />
EIGRP routers keep route and topology information readily available in RAM so they can react<br />
quickly to changes. Like OSPF, EIGRP keeps this information in several tables, or databases.<br />
* Successor &#8211; A successor is a route selected as the primary route to use to reach a<br />
destination. Successors are the entries kept in the routing table. Multiple successors for a<br />
destination can be retained in the routing table.<br />
* Feasible successor &#8211; A feasible successor is a backup route. These routes are selected at the<br />
same time the successors are identified, but are kept in the topology table. Multiple feasible<br />
successors for a destination can be retained in the topology table.<br />
EIGRP automatically summarizes routes at the classful boundary, the boundary where the<br />
network address ends as defined by class-based addressing. In most cases, auto summarization<br />
is a good thing, keeping the routing tables as compact as possible<br />
In the presence of discontiguous subnetworks, automatic summarization must be disabled for<br />
routing to work properly. To turn off auto-summarization, use the following command:<br />
Router(config-router)#no auto-summary<br />
QUESTION 5<br />
You need to configure EIGRP on all routers within the Chinatag network. Which two<br />
statements are characteristics of the routing protocol EIGRP? (Select two)<br />
A. Updates are sent as broadcast.<br />
B. Updates are sent as multicast.<br />
C. LSAs are sent to adjacent neighbors.<br />
D. Metric values are represented in a 32-bit format for granularity.<br />
Answer: B, D<br />
Explanation:<br />
EIGRP routers establish adjacencies with neighbor routers by using small hello packets. Hellos<br />
are sent by default every five seconds. An EIGRP router assumes that as long as it is receiving<br />
hello packets from known neighbors, those neighbors (and their routes) remain viable. By<br />
forming adjacencies, EIGRP routers do the following:<br />
1. Dynamically learn of new routes that join their network<br />
2. Identify routers that become either unreachable or inoperable<br />
You have been tasked with setting up summarization in the Chinatag EIGRP<br />
network. Which two statements are true about EIGRP manual summarization?<br />
(Select two)<br />
A. Manual summarization is configured on a per interface basis.<br />
B. When manual summarization is configured, auto-summarization is automatically<br />
disabled by default.<br />
C. The summary address is assigned an administrative distance of 10 by default.<br />
D. Manual summaries can be configured with the classful mask only.<br />
E. The summary address is entered into the routing table and is shown to be sourced from the<br />
Null0 interface.<br />
Answer: A, E<br />
Explanation:<br />
EIGRP automatically summarizes routes at the classful boundary, the boundary where the<br />
network address ends as defined by class-based addressing. In most cases, auto summarization<br />
is a good thing, keeping the routing tables as compact as possible<br />
In the presence of discontiguous subnetworks, automatic summarization must be disabled for<br />
routing to work properly. To turn off auto-summarization, use the following command:<br />
Router(config-router)#no auto-summary<br />
EIGRP also enables manual configuration of a prefix to use as a summary address. Manual<br />
summary routes are configured on a per-interface basis. The interface that will propagate the<br />
route summary must first be selected and then defined with the ip summary-address eigrp<br />
command, which has the following syntax: Router(config-if)#ip summary-address eigrp<br />
autonomous-system-number<br />
ip-address mask administrative-distance<br />
D 2.1.0.0/16 is a summary, 00:00:22, Null0<br />
Notice that the summary route is sourced from Null0, and not an actual interface.<br />
QUESTION 7<br />
Router CK1 4 is configured as an EIGRP stub router. What are three key concepts that<br />
apply when configuring the EIGRP stub routing feature in a hub and spoke network?<br />
(Select three)<br />
A. Stub routers are not queried for routes.<br />
B. A hub router prevents routes from being advertised to the remote router.<br />
C. A stub router should have only EIGRP hub routers as neighbors.<br />
D. EIGRP stub routing should be used on hub routers only.<br />
E. Spoke routers connected to hub routers answer the route queries for the stub router.<br />
F. Only remote routers are configured as stubs.<br />
Answer: A, C, F<br />
Explanation:<br />
The Enhanced Interior Gateway Routing Protocol (EIGRP) Stub Routing feature<br />
improves network stability, reduces resource utilization, and simplifies stub router<br />
configuration.<br />
Stub routing is commonly used in a hub and spoke network topology. In a hub and spoke<br />
network, one or more end (stub) networks are connected to a remote router (the spoke) that is<br />
connected to one or more distribution routers (the hub). The remote router is adjacent only to<br />
one or more distribution routers. The only route for IP traffic to follow into the remote router is<br />
through a distribution router. This type of configuration is commonly used in WAN topologies<br />
where the distribution router is directly connected to a WAN. The distribution router can be<br />
connected to many more remote routers. Often, the distribution router will be connected to 100<br />
or more remote routers. In a hub and spoke topology, the remote router must forward all<br />
nonlocal traffic to a distribution router, so it becomes unnecessary for the remote router to hold<br />
a complete routing table. Generally, the distribution router need not send anything more than a<br />
default route to the remote router.<br />
When using the EIGRP Stub Routing feature, you need to configure the distribution and<br />
remote routers to use EIGRP, and to configure only the remote router as a stub. Only specified<br />
routes are propagated from the remote (stub) router. The router responds to queries for<br />
summaries, connected routes, redistributed static routes, external routes, and internal routes<br />
with the message &#8220;inaccessible.&#8221; A router that is configured as a stub will send a special peer<br />
information packet to all neighboring routers to report its status as a stub router.<br />
More on:</p>
<p>http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s15/eigrpstb.</p>
<p>QUESTION 8<br />
You want to reduce the amount of EIGRP traffic across low speed links in the<br />
Chinatag network. Which is the most effective technique to contain EIGRP queries?<br />
A. Using a hierarchical addressing scheme<br />
B. Configuring route filters<br />
C. Establishing separate autonomous systems<br />
D. Route summarization<br />
E. None of the above<br />
Answer: D<br />
Explanation:<br />
EIGRP automatically summarizes routes at the classful boundary, the boundary where the<br />
network address ends as defined by class-based addressing. In most cases, auto summarization<br />
is a good thing, keeping the routing tables as compact as possible<br />
In the presence of discontiguous subnetworks, automatic summarization must be disabled for<br />
routing to work properly. To turn off auto-summarization, use the following command:<br />
Router(config-router)#no auto-summary<br />
EIGRP also enables manual configuration of a prefix to use as a summary address. Manual<br />
summary routes are configured on a per-interface basis. The interface that will propagate the<br />
route summary must first be selected and then defined with the ip summary-address eigrp<br />
command, which has the following syntax: Router(config-if)#ip summary-address eigrp<br />
autonomous-system-number<br />
ip-address mask administrative-distance<br />
QUESTION 9<br />
Routers CK1 and CK2 have formed an EIGRP neighbor relationship. In order for two<br />
routers to become EIGRP neighbors, which two values must match? (Select two)<br />
A. K values<br />
B. Delay<br />
C. Autonomous system<br />
D. Hello time<br />
E. Hold time F.<br />
Bandwidth<br />
Answer: A, C<br />
Explanation:<br />
Despite being compatible with IGRP, EIGRP uses a different metric calculation and hop-count<br />
limitation. EIGRP scales the IGRP metric by a factor of 256. That is because EIGRP uses a metric<br />
that is 32-bits long, and IGRP uses a 24-bit metric. By multiplying or dividing by 256, EIGRP can<br />
easily exchange information with IGRP.<br />
EIGRP also imposes a maximum hop limit of 224, which is slightly less than the 255 limit for IGRP<br />
However, this is more than enough to support most of the largest internetworks. To<br />
QUESTION 10<br />
Chinatag uses EIGRP as their internal routing protocol. Which three statements are true<br />
about EIGRP operation? (Select three)<br />
A. The maximum metric for the specific routes is used as the metric for the summary<br />
route.<br />
B. When summarization is configured, the router will also create a route to null 0.<br />
C. The summary route remains in the route table, even if there are no more specific<br />
routes to the network.<br />
D. Automatic summarization across major network boundaries is enabled by default.<br />
E. Summarization is configured on a per-interface level.<br />
Answer: B, D, E<br />
Explanation:<br />
EIGRP automatically summarizes routes at the classful boundary, the boundary where the<br />
network address ends as defined by class-based addressing. In most cases, auto summarization<br />
is a good thing, keeping the routing tables as compact as possible<br />
In the presence of discontiguous subnetworks, automatic summarization must be disabled for<br />
routing to work properly. To turn off auto-summarization, use the following command:<br />
Router(config-router)#no auto-summary<br />
EIGRP also enables manual configuration of a prefix to use as a summary address. Manual<br />
summary routes are configured on a per-interface basis. The interface that will propagate the<br />
summary routes are configured on a per-interface basis. The interface that will propagate the<br />
route summary must first be selected and then defined with the ip summary-address eigrp<br />
command, which has the following syntax: Router(config-if)#ip summary-address eigrp<br />
autonomous-system-number<br />
ip-address mask administrative-distance</p>
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<p>Exam Number/Code: 642-892<br />
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