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Cisco® 642-885 Exam Practice Questions (P. 3)

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Question #11
Which type of BGP session behaves like an EBGP session during session establishment but behaves like an IBGP session when propagating routing updates where the local preference, multi-exit discriminator, and next-hop attributes are not changed?
  1. A
    BGP sessions between a route reflector and its clients
  2. B
    BGP sessions between a route reflector and its non-client IBGP peers
  3. C
    BGP sessions between a route reflector and another route reflector
  4. D
    Intra-confederation IBGP sessions
  5. E
    Intra-confederation EBGP sessions

Correct Answer:
E
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/configuration/guide/rc37bgp.html#wp1191371
BGP Routing Domain Confederation
One way to reduce the iBGP mesh is to divide an autonomous system into multiple subautonomous systems and group them into a single confederation. To the outside world, the confederation looks like a single autonomous system. Each autonomous system is fully meshed within itself and has a few connections to other autonomous systems in the same confederation. Although the peers in different autonomous systems have eBGP sessions, they exchange routing information as if they were iBGP peers. Specifically, the next hop, MED, and local preference information is preserved. This feature allows you to retain a single IGP for all of the autonomous systems.

Question #12
You noticed a recent change to the BGP configuration on a PE router, the bgp scan time has been changed from the default value to 30s. Which three effects will this change have? (Choose three.)
  1. A
    The BGP table will be examined and verified more frequently
  2. B
    The BGP keepalive messages will be sent to the BGP peers at a faster rate
  3. C
    The BGP table will be modified more quickly in the event that a next-hop address becomes unreachable
  4. D
    The CPU load of the router will increase
  5. E
    The minimum time interval between sending EBGP and IBGP routing updates will decrease
  6. F
    The BGP convergence time will increase

Correct Answer:
ACD

Question #13
On Cisco IOS-XR, which BGP process can be distributed into multiple instances?
  1. A
    BGP process manager
  2. B
    BGP RIB process
  3. C
    BGP speaker process
  4. D
    BGP scanner process
  5. E
    BGP dampening process

Correct Answer:
C
Cisco IOS XR allows you to control the configuration of the number of distributed speakers and enables you to selectively assign neighbors to specific speakers.
On the CRS-1 platform, multiple speaker processes up to 15 may be configured. However, configuring all the different speakers on the primary route processor simply adds to the load on the single RP.
Distributed speaker functionality is useful if Distributed Route Processor (DRP) hardware is available to take advantage of process placement. Later sections in this chapter depict distributed
BGP and placement of BGP process speakers on DRPs on a CRS-1 router.
In addition to the speaker process, BPM starts the bRIB process once BGP is configured. bRIB process is responsible for performing the best-path calculation based on partial best paths received from the speaker processes. The best route is installed into the bRIB and is advertised back to all speakers. The bRIB process is also responsible for installing routes

Question #14
Refer to the configuration exhibit, taken from a Cisco IOS-XR router.


Which configuration change is required to properly enable this router as the signaling router for implementing source-based RTBH filtering?
  1. A
    Set community (no-export) in the route policy
  2. B
    Pass in the route policy
  3. C
    Set local-preference 1000 in the route policy
  4. D
    The 192.0.2.1/32 static route should be tagged as 666 (tag 666)

Correct Answer:
A

Question #15
Refer to the Cisco IOS-XR BGP configuration exhibit.


Identify two configuration errors. (Choose two.)
  1. A
    The neighbor-group efg is missing the ebgp-multihop 2 configuration
  2. B
    The ttl-security configuration command is missing the option to set the number of hops
  3. C
    The passall route policy is wrong
  4. D
    The route-policy passall in and route-policy passall out commands should be configured under the neighbor-group efg instead of the af-group abc
  5. E
    The maximum-prefix 10 configuration should be configured under the af-group abc instead of the neighbor-group efg

Correct Answer:
CE
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a008010a28a.shtml

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