NEW QUESTION 1
A service provider is deploying route redistributions for a large enterprise that wants to unify a few IGP routing domains into one to condense administration as well as common network and security policies. Which technique should be used to safely assume that the new routing domain is loop free?

• A. Enable filtering based on route-tagging on the redistribution points to avoid route- feedback.
• B. Define a static route to Null0 for all of the outgoing traffic on the redistribution points.
• C. Modify the metric associated with each redistributed prefix to implement loop-avoidance for inter-IGP routing domain designs.
• D. Disable the routing process on the interfaces with route-feedback potential on the redistribution points.

Answer: A

NEW QUESTION 2
Refer to the route policies exhibit.

Which five route policies will cause the routes to be dropped or passed? (Choose five)

• A. route-policy one will cause the routes to be dropped.
• B. route-policy two will cause the routes to be dropped.
• C. route-policy three will cause the routes to be dropped.
• D. route-policy four will cause the routes to be dropped.
• E. route-policy five will cause the routes to be dropped.
• F. route-policy one will cause the routes to be passed.
• G. route-policy two will cause the routes to be passed.
• H. route-policy three will cause the routes to be passed.
• I. route-policy four will cause the routes to be passed.
• J. route-policy five will cause the routes to be passed.

Answer: ACEGI

NEW QUESTION 3
Which two options are characteristics of Nonstop Forwarding and Nonstop routing? (Choose two.)

• A. NSR is graceful redundancy mechanism.
• B. NSR is stateful redundancy mechanism.
• C. NSF is stateful redundancy mechanism.
• D. NSF is graceful redundancy mechanism.

Answer: BD

NEW QUESTION 4
Refer to the Cisco IOS show command output shown in the exhibit.

Which of the following statements is correct?

• A. The best path to 10.2.10.1/32 was chosen because of the AS path.
• B. The best path to 10.2.10.1/32 was chosen because of the weight.
• C. The best path to 10.2.10.1/32 was chosen because of the local preference.
• D. The best path to 10.2.10.1/32 was chosen because of the MED.
• E. The best path to 10.2.10.1/32 was chosen because of the route origin.

Answer: B

NEW QUESTION 5
You are implementing OSPF as the IGP using a single OSPF area design. The router
memory usage for OSPF is too high. Which two methods can lower the OSPF memory usage? (Choose two.)

• A. Enable OSPF synchronization
• B. Implement multi-area OSPF
• C. Enable OSPF sham links to reduce the number of LSAs
• D. Implement route summarization on the ABRs
• E. Enable route leaking between Level 1 and Level 2 areas

Answer: BD

NEW QUESTION 6
Which high-availability mechanism is a detection protocol that is enabled at the interface and at the routing protocol levels?

• A. NSF
• B. SSO
• C. NSR
• D. BFD
• E. SDR

Answer: D

Explanation:
http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fs_bfd.html

NEW QUESTION 7
Refer to the Cisco IOS XR route policy exhibit.

If the original incoming routing update has an MED of 10 and a local preference of 100, how will the routing update be modified?

• A. The local preference will be set to 100, the MED will be set to 10, and the weight will be set to 100.
• B. The local preference will be set to 100, the MED will be set to 10, and the weight will be set to 200.
• C. The local preference will be set to 200, the MED will be set to 10, and the weight will be set to 100.
• D. The local preference will be set to 200, the MED will be set to 10, and the weight will be set to 200.

Answer: C

NEW QUESTION 8
What is recursive lookup in BGP and how does it work?

• A. The router looks up the EBGP route and the EBGP next hop to reach a destination in the remote A
• B. Then the router looks up the route to reach the EBGP next hop using the IBGP.
• C. The router looks up the IBGP route and the IBGP next hop to reach a destination in the remote A
• D. Then the router looks up the route to reach the IBGP next hop using the EBGP.
• E. The router looks up the BGP route and the BGP next hop to reach a destination in the remote A
• F. Then the router looks up the route to reach the BGP next hop using the IGP.
• G. The router looks up the route and the next hop to reach a destination in the remote AS using the IG
• H. Then the router looks up the route to reach the next hop using BGP.
• I. The router perform three routing lookups to determine the route to reach a destination in the remote A
• J. The first lookup is done using EBGP, the second lookup is done using IBGP, and the third lookup is done using the IGP.

Answer: C

Explanation:
A few different approaches are available to deal with iBGP and synchronization. We may turn on the synchronization option on our routers and wait for the IGP to have a route for the destination before it’s advertised to peers. Another option is to simply use a full mesh, so that iBGP convergence isn’t an issue.
Clearly that isn’t going to happen when a network’s core needs to scale: it will implement something like reflectors that cause iBGP’s full mesh to be broken.
The real alternative, if you don’t enable synchronization, is to use route recursion. A recursive route lookup uses the BGP next-hop attribute to actually make a different route lookup. The IGP can use the destination network instead of the AS-path to determine where it gets sent. Even if the iBGP hasn’t converged, the routers will still know how to get to that network, since it will exist in the router it was advertised from, who will know the next-hop.

NEW QUESTION 9
Which option describes a function of an OSPF virtual link?

• A. Create redundant path between an area and the backbone.
• B. Provide a backdoor link for traffic to flow through between areas.
• C. Connect the two parts of a partitioned backbone through a nonbackbone area.
• D. Create a virtual connection between two routers from different areas.

Answer: C

NEW QUESTION 10
In which network environment is IS-IS adjacency check important?

• A. in a multitopology environment where there are different instances of IS-IS running on the same router
• B. in an IPv4/IPv6 environment and running single-topology IS-IS
• C. when a level L1/L2 IS-IS router is neighboring with a Level 1 only or Level 2 only router
• D. when IS-IS neighbors are in an NBMA environment like over Frame Relay
• E. when IS-IS neighbors are in a broadcast environment like an Ethernet LAN

Answer: B

Explanation:

C:Documents and Settingsuser-nwzDesktop1.JPG

NEW QUESTION 11
Which option describes how an engineer must configure route summarization on a Cisco IOS XE OSPF-enabled network of routers?

• A. area range command under the router OSPF process of the ABR
• B. area range command under the router OSPF process of the router wanting to originate the summary route from
• C. summary-address command under the OSPF process of the ABR
• D. summary-address command under the OSPF process of the router wanting to originate the summary route from
• E. network statement for the aggregate address under the router OSPF process on the ABR
• F. network statement for the aggregate address under the router OSPF process of the router wanting to originate the summary route from

Answer: A

NEW QUESTION 12
Which router has the su 10.5.10.0/24 [20/115] entry pointing to NullO in its routing table and why? (Choose two.)

• A. CE5
• B. PE5
• C. PE6
• D. The router is summarizing 10.5.10.1/32 into 10.5.10.0/24
• E. The router is suppressing the 10.5.10.0/24 route
• F. The L2/L1 IS-IS router is blocking the 10.5.10.0/24 interarea route to the L1-only router

Answer: DF

Explanation:
# show clns route

NEW QUESTION 13
Refer to the exhibit.

Assume that XR2 and R3 have been configured correctly for OSPF area 0. Which command is needed to configure XR2 as an ABR between area 0 and area 1?

• A. router ospf 1address-family ipv4interface GigabitEthernet0/0/0/1area 1
• B. router ospf 1area 1interface GigabitEthernet0/0/0/1
• C. router ospf 1area 1network 10.10.12.0 0.0.0.255
• D. router ospf 1interface GigabitEthernet0/0/0/1area 1

Answer: B

NEW QUESTION 14
An engineer is working on routers within AS 100. Which regular expression can be used in an AS path access list to match locally originated routes from AS 100?

• A. ^100$
• B. ^$
• C. _100$
• D. ^[0-9]*$

Answer: B

NEW QUESTION 15
Refer to the exhibit.

R1 is advertising subnets 1.1.1.X/32 via eBGP. XR4 must accept only the first seven subnets in its BGP table. Which configuration must occur on XR2 to meet these parameters?

• A. route-policy INBOUNDif destination in SUBNETS then pass endifrouter bgp 100 neighbor 10.10.14.1 address-family ipv4 unicast route-policy INBOUND in
• B. route-policy INBOUNDif destination in FILTER then pass endifrouter bgp 100 neighbor 10.10.14.1 address-family ipv4 unicast route-policy INBOUND in
• C. router bgp 100neighbor 10.10.14.1 address-family ipv4 unicast route-policy FILTER in
• D. router bgp 100neighbor 10.10.14.1 address-family ipv4 unicast route-policy SUBNETS in

Answer: B

NEW QUESTION 16
What is the default OSPF seed metric and type?

• A. 10 and E1
• B. 10 and E2
• C. 20 and E1
• D. 20 and E2
• E. 0 and E1
• F. 0 and E2

Answer: D

NEW QUESTION 17
An engineer is working for a service provider who is strategically important to the Internet data traffic. The CTO is promoting a core infrastructure upgrade to connect via optical links network service providers. Which three concerns must be addressed while planning the new BGP features and functionalities? (Choose three.)

• A. BGP suboptimal routing
• B. IPv4 exhaustion
• C. routers and switches hardware capabilities
• D. route dampening of current customers
• E. multihoming policies of new customers
• F. IGP reconvergence time on the inter-AS links
• G. BGP blackholing when acting as transit autonomous system

Answer: ACG

NEW QUESTION 18
Which value must be configured when redistributing OSPFv2 into RIP?

• A. metric
• B. bandwidth
• C. delay
• D. MTU
• E. reliability

Answer: A

NEW QUESTION 19
What is the configured IS-IS circuit-type between the CE5 and PE5 routers and between the PE5 and PE6 routers? (Choose two.)

• A. Circuittype L1 between CE5 and PE5 4
• B. Circuittype L1/L2 between CE5 and PE5
• C. Circuittype L2 between CE5 and PE5
• D. Circuittype L1 between PE5 and PE6
• E. Circuittype L1/L2 between PE5 and PE6
• F. Circuittype L2 between PE5 and PE6

Answer: AF

Explanation:
#show clns neighbor

NEW QUESTION 20
An engineer is configuring an eBGP peering session. What is the default TTL value?

• A. 1
• B. 64
• C. 127
• D. 255

Answer: A

NEW QUESTION 21
Refer to the exhibit.

R1 is advertising subnets 1.1.1.X/32 via eBGP. XR2 must accept only the first seven subnets in its BGP table. Which configuration must occur on XR2 to meet these parameters?

• A. route-policy INBOUND if destination in FILTER then pass endifrouter bgp 100 neighbor10.10.14.1 address-family ipv4 unicastroute-policy INBOUND in
• B. router bgp 100neighbor 10.10.14.1 address-family ipv4 unicastroute-policy FILTER in
• C. router bgp 100neighbor 10.10.14.1 address-family ipv4 unicastroute-policy SUBNETS in
• D. route-policy INBOUNDif destination in SUBNETS thenpass endifrouter bgp 100 neighbor 10.10.14.1 address-family ipv4 unicastroute-policy INBOUND in

Answer: A

NEW QUESTION 22
Refer to the PE1 router routing table output exhibit.

What is causing the i su 10.1.10.0/24 [115/30] via 0.0.0.0, 00:40:34, Null0 entry on the PE1 router routing table?

• A. The PE1 router is receiving the 10.1.10.0/24 summary route from the upstream L1/L2 IS-IS router.
• B. The PE1 router has been configured to summarize the 10.1.10.x/32 IS-IS routes to 10.1.10.0/24.
• C. The 10.1.10.0/24 has been suppressed because IS-IS auto-summary has been disabled on the PE1 router.
• D. The 10.1.10.0/24 has been suppressed because of a route policy configuration on the PE1 router.
• E. The 10.1.10.0/24 has been suppressed because the more specific 10.1.10.x/32 IS-IS routes have been configured to leak into the IS-IS non-backbone area.

Answer: B

Explanation:

C:Documents and Settingsuser-nwzDesktop1.JPG

NEW QUESTION 23
What are two purposes of the BGP scan-time command? (Choose two.)

• A. to tune the BGP process which walks the BGP table and confirms the reachability of next hops
• B. to allow faster detection of downed BGP peers
• C. to improve BGP convergence time
• D. to tune the BGP update interval
• E. to decrease the effects of unstable routes by increasing the route suppression time

Answer: AC

Explanation:
http://www.networkers-online.com/blog/2008/12/bgp-performance-tunning-convergence-stability-scalabilityand-nsf-part-2/
Background BGP scanner
It is responsible for BGP housekeeping by scanning both the BGP RIB and the IP RIB and cleaning and sorting things out.
BGP monitors the next hop of the installed routes to verify next-hop reachability and to select, install, and validate the BGP best path. By default, the BGP scanner polls the RIB for this information every 60 seconds.
During the 60 second time period between scan cycles, IGP instabilities or other network failures can cause temporarily black holes and routing loops.
NOTE With Cisco IOS the default timer is 60 seconds for the IPv4 address family and 15 seconds for the
VPNv4 address family in order to optimize the VPNs routing table convergence. This timer can be controlled via the following command:
Router(config-router)#bgp scan-time <5-60>

NEW QUESTION 24
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