Cisco 642-885 Online Practice Questions and Exam Preparation

Cisco 642-885 Online Questions & Answers

• Question 91:

  The bsr-border router PIM interface configuration command is used for what purpose?

  A. To enable the router as the candidate RP
  B. To enable the router as the candidate BSR
  C. To enable the router as the BSR mapping agent
  D. To set up an administrative boundary to prevent BSR messages from being sent out through an interface
  E. To define a boundary to restrict the RP discovery and announcement messages from being sent outside the PIM-SM domain
  D. To set up an administrative boundary to prevent BSR messages from being sent out through an interface

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• Question 92:

  What is enabled by default on Cisco IOS-XR routers and cannot be disabled?

  A. SSH server
  B. Multicast routing
  C. IPv4 and IPv6 CEF
  D. IPv6 routing
  E. CDP
  F. BFD
  C. IPv4 and IPv6 CEF

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  Before using the BGP policy accounting feature, you must enable BGP on the router (CEF is enabled by default).

• Question 93:

  On Cisco IOS-XR, which BGP process can be distributed into multiple instances?

  A. BGP process manager
  B. BGP RIB process
  C. BGP speaker process
  D. BGP scanner process
  E. BGP dampening process
  C. BGP speaker process

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  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 94:

  Refer to the exhibit.

  

  Router A and Router B are connected via GigabitEthernet interfaces, but they are unable to form an MSDP neighborship. Which two components must be addressed when fixing the MSDP peering issue? (Choose two.)

  A. An msdp default peer is configured on both routers.
  B. A BGP process on each router is present so that MSDP can peer and carry updates.
  C. The router interfaces are PIM-enabled to transport MSDP updates.
  D. The connect-source attribute is configured with a host route under the MSDP process.
  E. The MSDP peering on both routers specifies an origin ID so that it can peer.
  F. The router A loopback interface configures the correct subnet mask.
  D. The connect-source attribute is configured with a host route under the MSDP process.
  F. The router A loopback interface configures the correct subnet mask.

• Question 95:

  Which multicast group range is reserved for SSM?

  A. 224.0.0.0/8
  B. 225.0.0.0/8
  C. 232.0.0.0/8
  D. 239.0.0.0/8
  C. 232.0.0.0/8

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  PIM-SSM Operations PIM in Source Specific Multicast operation uses information found on source addresses for a multicast group provided by receivers and performs source filtering on traffic. ꞏBy default, PIM-SSM operates in the 232.0.0.0/8 multicast group range for IPv4 and ff3x::/32 (where x is any valid scope) in IPv6. To configure these values, use the ssm range command. ꞏIf SSM is deployed in a network already configured for PIM-SM, only the last-hop routers must be upgraded with Cisco IOS XR software that supports the SSM feature. ꞏNo MSDP SA messages within the SSM range are accepted, generated, or forwarded

• Question 96:

  Which command set is used to implement an IPv6 PIM with the global scope embedded RP address of 2001:DB8::1 on a Cisco IOS XE router?

  A. ipv6 unicast-routing ipv6 multicast-routing ipv6 pim rp-address 2001:DB8::1 bidir
  B. ipv6 multicast-routing ipv6 pim rp-address 2001:DB8::1
  C. ipv6 unicast-routing ipv6 multicast-routing ipv6 pim rp-address FF7E:0120:2001:DB8:1111::4321
  D. ipv6 unicast-routing ipv6 multicast-routing int Lo0 ipv6 mld join-group FF7E:0120:2001:DB8:1111::4321
  E. ipv6 unicast-routing ipv6 multicast-routing int Lo0 ipv6 mld join-group FF75:0120:2001:DB8:1111::4321
  D. ipv6 unicast-routing ipv6 multicast-routing int Lo0 ipv6 mld join-group FF7E:0120:2001:DB8:1111::4321

• Question 97:

  Which two options are advantages of an IPv6 dual-stack implementation in an enterprise environment? (Choose two.)

  A. simplifies the route redistribution policies complexity
  B. requires IPv6-to-IPv4 translation on the uplinks to the service providers
  C. provides built-in support for Kerberos authentication
  D. does not have to worry about NAT traversal
  E. supports multicast properly
  D. does not have to worry about NAT traversal
  E. supports multicast properly

• Question 98:

  Which two features are used to provide high availability multicast? (Choose two.)

  A. BFD
  B. NSF/SSO
  C. PIM NSR
  D. PIM triggered join
  E. IGMP triggered report
  F. MSDP
  B. NSF/SSO
  D. PIM triggered join

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  Triggered joins are sent when the primary or the secondary RPF information changes. No RPF change prunes are sent for MoFRR streams.

  mofrr

  To perform a fast convergence (multicast-only fast reroute, or MoFRR) of specified routes/flows when a failure is detected on one of multiple equal-cost paths

  between the router and the source, use the mofrr command under PIM configuration mode.

  mofrr rib acl_name

  no rib acl_name

• Question 99:

  A network engineer for an ISP wants to reduce the number of iBGP adjacencies. A merge is taking place with another ISP network, so the network engineer needs to make both ASNs look like a single network for the Internet. Which BGP technology is most suitable?

  A. route reflector
  B. confederation
  C. clustering
  D. peer group
  B. confederation

• Question 100:

  Which technology is categorized as multicast ASM and multicast SSM?

  A. IP telephony
  B. video conferencing
  C. IPTV
  D. live streaming
  D. live streaming