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QUESTION 50
When configuring BGP route dampening on Cisco routers, what is the correct default half-life-time?
A. 15 minutes
B. 45 minutes
C. 60 minutes
D. 120 minutes

Correct Answer: A Section: (none) Explanation
Explanation/Reference: QUESTION 51
The core routers within a transit AS are running both IBGP and IGP. The edge routers within the transit AS are using the next-hop-self option to establish the IBGP sessions. What can be implemented to improve the routing performance to all external prefixes?
A. enable route redistribution from BGP into IGP
B. disable BGP synchronization on all the core routers
C. enable CEF on all the core and edge routers
D. enable route redistribution from IGP into BGP
E. use route reflectors within the core

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 52
Which command allows IBGP to scale within an AS?
A. neighbor {ip-address} update-source loopback0
B. neighbor {ip-address} route-reflector-client
C. neighbor {ip-address} ebgp-multihop 2
D. neighbor {ip-address} next-hop-self
E. neighbor {ip-address} remote-as {confederation-id}
F. no sync

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 53
Look at the picture.
This question is not scored, answer it or not will not effect your score. So we dont provide answers for it

A.
B.
C.
D.

Correct Answer: Section: (none) Explanation
Explanation/Reference:
Answer: Check certifyme eEngine, Download from Member Center
QUESTION 54
Refer to the Exhibit. How can Provider B move to AS 601 without forcing Customer A to immediately reconfigure?

A. Configure a second BGP AS on the Provider B router. Use the local AS feature with the dual-as keyword.
B. Originate a default route from the Provider A network into the customer network. This will draw routed traffic into the provider network.
C. Configure a confederation between Customer A and the provider networks. Use the BGP translate AS feature at the edge of the confederation.
D. Customer A must update its BGP neighbor statements or the BGP sessions will no longer match.
E. Add a wide area link between Provider A and Customer A configured for eBGP peering. Configure the customer BGP to prevent it from becoming a transit network.

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 55
How should the EBGP session between R1 and R2 be established to enable load balancing? (Choose three.)

A. use the maximum-paths 2 option
B. use the ebgp-multihop 2 option
C. use static routes on R1 and R2 to reach the other router’s loopback
D. establish a single EBGP session using the loopback0 interface IP address on R1 and R2
E. establish two EBGP sessions using both the S0 and S1 interface IP address on R1 and R2

Correct Answer: BCD Section: (none) Explanation
Explanation/Reference:
QUESTION 56
Which show command can be used to display the originator ID and cluster-list?
A. show ip bgp
B. show ip bgp sum
C. show ip route bgp
D. show ip route {prefix}
E. show ip bgp {prefix}
F. show ip bgp neighbors {ip address}

Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 57
What is the effect on existing BGP connections when Path MTU (PMTU) discovery is enabled?
A. They dynamically renegotiate the new MTU size.
B. After timing out, they will inherit the configured MTU size.
C. The connections are reset and negotiate MTU size.
D. There is no effect on existing connections.

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 58
Look at the picture.

A.
B.
C.
D.

Correct Answer: Section: (none) Explanation
Explanation/Reference:
Answer: Check certifyme eEngine, Download from Member Center
QUESTION 59
External BGP peers must normally reside on a directly connected network. Sometimes it is useful to relax this restriction to enable load balancing. Which neighbor command option is used to permit this?
A. soft-reconfiguration
B. remote-as
C. ebgp-multihop
D. next-hop-self
E. send-community
F. no sync

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 60
Given the following configurations, R2 and R3 are not able to successfully establish the IBGP session using the loopback 0 interfaces. What could be the cause of this problem?!! output omitted!hostname R2!interface loopback 0ip address 2.2.2.2!interface e0ip address 10.1.1.1 255.255.255.0no shut!interface e1ip address 10.2.2.1 255.255.255.0no shut!router bgp 65101neighbor 172.16.1.1 remote-as 65100neighbor 3.3.3.3 remote-as 65101!router eigrp 101network 10.0.0.0network 2.0.0.0!!! output omitted!hostname R3!interface loopback 0ip address 3.3.3.3!interface e0ip address 10.1.1.2 255.255.255.0no shut!interface e1ip address 10.2.2.2 255.255.255.0no shut!router bgp 65101neighbor
192.168.1.1 remote-as 65102neighbor 2.2.2.2 remote-as 65101!router eigrp 101network 10.0.0.0network 3.0.0.0!

A. The “No Sync” BGP configuration command is missing.
B. R2 and R3 are not using the loopback0 IP address as the source address for the BGP messages to each other.
C. The “network 2.0.0.0” BGP configuration command is missing on R2 and the “network 3.0.0.0” BGP configuration command is missing on R3.
D. The “neighbor 2.2.2.2 ibgp-multihop 2” BGP configuration command is missing on R3 and the “neighbor 3.3.3.3 ibgp-multihop 2” BGP configuration command is missing on R2.

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 61
Refer to the outputs shown in the exhibit. What could be preventing the R1 router from receiving any prefixes from the R2 BGP neighbor?

A. There is a TCP session establishment problem between R1 and R2.
B. The no sync command is missing on R2.
C. The no sync command is missing on R1.
D. R2 is using the wrong AS number in its neighbor 192.168.31.2 remote-as statement.
E. R1 is using the wrong AS number in its neighbor 192.168.31.1 remote-as statement.
F. Both R1 and R2 are not using a loopback address to source their BGP packets.

Correct Answer: E Section: (none) Explanation
Explanation/Reference:
QUESTION 62
Examine the topology and the configuration output. If the show ip bgp summary command was issued from R1, how many prefixes would it have in the State/PfxRcd field?

A. 0
B. 1
C. 2
D. 3

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 63
Which prefix-list will permit the 172.16.1.32 255.255.255.240 prefix?
A. ip prefix-list test permit 172.16.1.0/28
B. ip prefix-list test permit 172.0.0.0/8 le 30
C. ip prefix-list test permit 172.16.0.0/16 eq 28
D. ip prefix-list test permit 172.0.0.0/8 ge 29

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 64
Lab.

A.
B.
C.
D.

Correct Answer: Section: (none) Explanation
Explanation/Reference:
Answer: Check certifyme eEngine, Download from Member Center
QUESTION 65
What is a key benefit of implementing the bgp dmzlink-bw command?
A. establishes a secure BGP link between eBGP and iBGP peers
B. enables the unequal cost path load balancing feature for external BGP links
C. allows BGP to use link bandwidth as a metric when computing best route selection
D. increases BGP security by dynamically allocating community strings to eBGP routes

Correct Answer: B Section: (none) Explanation Explanation/Reference:
QUESTION 66
Refer to the diagram. What should be changed within AS 50001 to improve the route reflector design?

A. Add a physical link between R1 and R2.
B. Add a physical link between the clients (R3 and R4, and between R4 and R5).
C. Remove the IBGP session between the two redundant RRs (R1 and R2).
D. Add an IBGP session between each pair of clients (between R3 and R4, R4 and R5).
E. Make R4 the RR and R1 and R2 its clients. R3 and R5 should be a non-RR/non-client.

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 67
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

Correct Answer: AC Section: (none) Explanation
Explanation/Reference:
QUESTION 68
In a Transit AS, how do the internal routers within the Transit AS forward packets destined for the external networks using a scalable solution?
A. using the default route
B. using the IGP routes where the external networks are redistributed into the IGP by the edge routers C. using the EBGP routes where the external networks are redistributed into the IBGP by the edge routers
D. using the IBGP routes, then using recursive lookup based on IGP information to resolve the BGP next-hop

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 69
How does the extended community cost feature influence the BGP best path selection?
A. alters the BGP AS exit path selection by adding the link cost to the local preference
B. acts as a best path “tie breaker” when multiple IGP equal cost paths occur
C. reflects the bandwidth of links entering the local AS from eBGP neighbors (in the MED attribute)
D. selects the BGP route with the highest attached extended community cost value
E. inserts the cost attribute after the MED attribute comparison, forcing best path route selection if all other preferred route selection criteria are equal

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 70
When verifying the BGP neighbor relationships on your router, you issue the show ip bgp summary command and there were no results. Which of the following could be the problem?
A. The TCP session to the BGP neighbor can’t be established.
B. There are no BGP neighbors configured.
C. All BGP updates from the BGP neighbor were filtered out.
D. The neighbor link is down.

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 71
You are a customer who is multihomed to two different ISPs-one for primary and another for backup. Each ISP assigned you a different AS number. How should you implement your AS number?
A. Use the AS number assigned by the primary ISP.
B. Use the AS number assigned by the backup ISP.
C. Use both AS numbers.
D. Use the AS number assigned by one of the ISPs, then use AS number translation when connecting to the other ISP.
E. Use the AS number assigned by one of the ISPs, then use AS-path prepending to prepend the other AS number when connecting to the other ISP.

Correct Answer: D Section: (none) Explanation Explanation/Reference:
QUESTION 72
Based on the following show ip bgp neighbor 10.1.1.1 output:R1#show ip bgp neighbor 10.1.1.1BGP neighbor is 10.1.1.1, remote AS 65102, external linkBGP version 4, remote router ID 0.0.0.0BGP state=IdleLast read 00:00:04, hold time is 180, keepalive interval is 60 secondsReceived 0 messages, 0 notifications, 0 in queueSent 0 messages, 0 notifications, 0 in queueRoute refresh request: received 0, sent 0Default minimum time between advertisement runs is 30 secondsFor address family: IPv4 UnicastBGP table version 1, neighbor version 0Index 2, Offset 0, Mask 0x40 accepted prefixes consume 0 bytesPrefix advertised 0, suppressed 0, withdrawn 0Connections established 0; dropped 0Last reset neverExternal BGP neighbor not directly connected.No active TCP connectionWhat is causing the BGP session to the 10.1.1.1 neighbor to remain in the Idle state?
A. There is an AS number configuration error.
B. The EBGP-multihop value for neighbor 10.1.1.1 is set to the default value.
C. There is an access-list blocking TCP port 179 traffic between the two BGP neighbors.
D. The BGP session is using the loopback interface but the update-source is not set to specify the loopback interface.

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 73
Which three conditions can make a transit autonomous system unable to forward packets from one neighboring autonomous system to another neighboring autonomous system? (Choose three.)
A. sync enabled
B. bgp next-hop not reachable
C. no full-mesh IBGP and not using route reflectors or confederations
D. non-directly connected IBGP neighbors
E. non-directly connected EBGP neighbors
F. EBGP to IBGP route redistribution configuration errors

Correct Answer: ABC Section: (none) Explanation
Explanation/Reference:
QUESTION 74
A customer multihomed to two ISPs is assigned a different AS number from each ISP. In this case, which BGP configuration option can the customer use to resolve this issue?
A. set as-path prepend {as-number…}
B. neighbor {ip-address} filter-list {as-path acl number} out
C. neighbor {ip-address} filter-list {as-path acl number} in
D. neighbor {ip-address} local-as {private-as}
E. neighbor {ip-address} ebgp-multihip
F. neighbor {ip-address} remove-private-as
Correct Answer: D Section: (none) Explanation

Explanation/Reference:
QUESTION 75
Refer to the exhibit. Which of these best describe why 21.0.0.0 via the next hop of 2.3.4.5 has been selected as the best path to the network?

A. Because it has the higher MED.
B. Because it has the shortest AS path.
C. Because the BGP table has not converged.
D. Because it is the oldest learned path.

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 76
Which statement is correct when utilizing the BGP TTL security check feature?
A. It is configured locally for each eBGP peering session.
B. It compares the value of the received packet TTL against a BGP interface Access-List.
C. It is not functional on multihop BGP peering sessions.
D. It generates a syslog error if a “forged” packet is received.
E. It eliminates the need for BGP keepalive packets.

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
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