Cisco 642-661 Online Practice Questions and Exam Preparation

Cisco 642-661 Online Questions & Answers

• Question 31:

  In reference to BGP route flap dampening feature, when will the penalty and the flap history of a route clear?

  A. When the penalty associated with a route reaches the reuse limit.
  B. When a route is in the history state for longer than the half-time limit.
  C. When the penalty associated with a route reaches the suppress limit.
  D. When the penalty associated with a route drops below half the reuse limit.
  D. When the penalty associated with a route drops below half the reuse limit.

• Question 32:

  Exhibit:

  R1#show ip bgp BGP table version is 1, local router ID is 10.0.0.1 Status codes: s suppressed, d damped, h history, *valid,>best,iinternal Origin codes: i - IGP, e - EGP,? - incomplete Network Next Hop Metric LocPrf Wight Path *i133.3.0.0 3.3.3.3 0 100 0 65101 i *i172.0.0.0/8 20.1.1.5 0 100 0 65102 i R1#show ip route Codes: C - connected, S - static, I - IGRP, R -RIP, M -mobile, B

  -BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR, P - periodic downloaded staticroute T - traffic engineered route Gateway of last resort is not set C 30.0.0.0/8 is directly connected, FastEthernet0/0 C 10.0.0.0/8 is directly connected, Loopback111 C 40.0.0.0/8 is directly connected, Serial0/0

  Based on the exhibits show ip bg and show ip route output, what is the most likely problem that causes the two IBGP routes NOT to be selected as the best route in the BGP table?

  A. The Weight is 0.
  B. The origin code is "i,".
  C. The Metric (MED) is 0.
  D. The BGP next-hop is not reachable.
  D. The BGP next-hop is not reachable.

• Question 33:

  R-4 >show ip bgp 172.0.0.0 BGP routing table entry for 172.0.0.0/8, version 4 Paths: (1 available, best #1, table Default-IP-Routing-Table) Advertised to non peer-group peers:

  192.168.1.6

  50111

  2.2.2.2 (metric 2323456) from 3.3.3.3 (3.3.3.3)

  Origin IGP, metric 0, localpref 100, valid, internal, best Originator: 2.2.2.2, Cluster list: 3.3.3.3

  Based on the shown ip bgp 172.0.0.0 output shown, which statement is true about the 172.0.0.0/8 prefix?

  A. It is received from an EBGP neighbor.
  B. It is received from an intra-confederation EBGP neighbor.
  C. It is received from an intra-confederation IBGP neighbor.
  D. It is received from a route reflector.
  D. It is received from a route reflector.

• Question 34:

  What is the correct command to set the BGP scanner interval to two minutes?

  A. The maximum scanning interval cannot exceed one minute.
  B. bgp scan-time 2
  C. bgp scan-time 120
  D. bgp scan-time 2 60
  A. The maximum scanning interval cannot exceed one minute.

• Question 35:

  Which one of these statements regarding intraconfederation EBGP sessions is correct?

  A. Member-AS numbers are removed when a router sends a BGP update over anintraconfederation EBGP session.
  B. Anintraconfederation EBGP session behaves like an IBGP session when propagating routing updates.
  C. Updates from anintraconfederation EBGP neighbor are subject to the BGP split horizon rule.
  D. Intraconfederation EBGP sessions must be established over loopback interfaces.
  E. Intraconfederation EBGP neighbors must be directly connected.
  B. Anintraconfederation EBGP session behaves like an IBGP session when propagating routing updates.

• Question 36:

  Which two statements regarding route reflectors are true? (Choose two)

  A. A non-route reflector capable router cannot be a client.
  B. A hierarchical route reflector design is where a route reflector client is not directly connected to the route reflector.
  C. If a client has IBGP sessions to other clients in the same cluster, those clients will receive unnecessary duplicated BGP updates.
  D. If a client in one cluster has an IBGP session to a route reflector that belongs to different clusters, the clients in the other cluster will receive unnecessary duplicated BGP updates.
  C. If a client has IBGP sessions to other clients in the same cluster, those clients will receive unnecessary duplicated BGP updates.
  D. If a client in one cluster has an IBGP session to a route reflector that belongs to different clusters, the clients in the other cluster will receive unnecessary duplicated BGP updates.

• Question 37:

  What do the following commands accomplish?

  R(config-router)#neighbor {ip addressII} route-map {name} out R(config)#route-map {name} permit 10 R(config-route-map)#set as-path prepend {AS-Number} {AS-Number}

  A. They influence outbound-traffic BGP path selection.
  B. They influence inbound-traffic BGP path selection.
  C. They influence both inbound and outbound-traffic BGP path selection.
  D. They influence BGP path selection using AS-path filtering.
  B. They influence inbound-traffic BGP path selection.

• Question 38:

  The purpose of the bgp always-compare-med command is to compare the MED ______.

  A. Even if the routes originate in different ASs.
  B. Even if the routes originate from the same AS.
  C. Even if the routes have different AS-Path length.
  D. Last, after all other path attributes are compared.
  A. Even if the routes originate in different ASs.

• Question 39:

  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. EBGP to IBGP route redistribution configuration errors
  B. no full-mesh IBGP and not using route reflectors or confederations
  C. non-directly connected IBGP neighbors
  D. sync enabled
  E. bgp next-hop not reachable
  F. non-directly connected EBGP neighbors
  B. no full-mesh IBGP and not using route reflectors or confederations
  D. sync enabled
  E. bgp next-hop not reachable

• Question 40:

  How does the extended community cost feature influence the BGP best path selection?

  A. inserts the cost attribute after the MED attribute comparison, forcing best path route selection if all other preferred route selection criteria are equal
  B. selects the BGP route with the highest attached extended community cost value
  C. alters the BGP AS exit path selection by adding the link cost to the local preference
  D. acts as a best path "tie breaker" when multiple IGP equal cost paths occur
  E. reflects the bandwidth of links entering the local AS fromeBGP neighbors (in the MED attribute)
  D. acts as a best path "tie breaker" when multiple IGP equal cost paths occur