642-885 Latest Exam (Mar 2018)

[Free] 2018(Mar) EnsurePass Testking Cisco 642-885 Dumps with VCE and PDF 61-70

April 9, 2018

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Deploying Cisco Service Provider Advanced Network Routing

Question No: 61

When implementing Anycast RP, the RPs are also required to establish which kind of peering with each other?

  1. BGP

  2. Multiprotocol BGP

  3. MSDP

  4. Bidirectional PIM

  5. PIM SSM

Answer: C Explanation:

http://www.cisco.com/en/US/docs/ios/solutions_docs/ip_multicast/White_papers/anycast.ht ml

Using Anycast RP is an implementation strategy that provides load sharing and redundancy in Protocol Independent Multicast sparse mode (PIM-SM) networks. Anycast RP allows two or more rendezvous points (RPs) to share the load for source registration and the ability to act as hot backup routers for each other. Multicast Source Discovery Protocol (MSDP) is the key protocol that makes Anycast RP possible.

Question No: 62

Given the IPv6 address of 2001:0DB8::1:800:200E:88AA, what will be its corresponding the solicited-node multicast address?

A. FF01::1:200E:88AA

B. FF01::1:FF0E:88AA

C. FF01:0DB8::1:800:200E:88AA

D. FF02::1:FF0E:88AA

E. FF02::1:200E:88AA

F. FF02:0DB8::1:800:200E:88AA

Answer: D Explanation:

IPv6 nodes (hosts and routers) are required to join (receive packets destined for) the following multicast groups:

鈥ll-nodes multicast group FF02:0:0:0:0:0:0:1 (scope is link-local)

鈥olicited-node multicast group FF02:0:0:0:0:1:FF00:0000/104 for each of its assigned unicast and anycast addresses

IPv6 routers must also join the all-routers multicast group FF02:0:0:0:0:0:0:2 (scope is link- local).

The solicited-node multicast address is a multicast group that corresponds to an IPv6 unicast or anycast address. IPv6 nodes must join the associated solicited-node multicast group for every unicast and anycast address to which it is assigned. The IPv6 solicited- node multicast address has the prefix FF02:0:0:0:0:1:

FF00:0000/104 concatenated with the 24 low-order bits of a corresponding IPv6 unicast or anycast address (see Figure 2). For example, the solicited-node multicast address corresponding to the IPv6 address 2037::01:800:200E:8C6C is FF02::1:FF0E:8C6C. Solicited-node addresses are used in neighbor solicitation messages

Question No: 63

Which two functions are supported for BGP extension MP-BGP for IP multicasting?

(Choose two.)

  1. A network can support incongruent unicast and multicast topologies.

  2. A network can support congruent unicast and multicast topologies.

  3. MP-BGP is an enhanced BGP that carries routing information for multiple network layer protocols and IP multicast routes.

  4. MP-BGP carries single sets of routes for unicast routing and multicast routing.

  5. MP-BGP is useful when a link dedicated to multicast and unicast traffic is desired.

Answer: A,C

Question No: 64

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

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Which configuration change is required to properly enable this router as the signaling router for implementing source-based RTBH filtering?

  1. Set community (no-export) in the route policy

  2. Pass in the route policy

  3. Set local-preference 1000 in the route policy

  4. The static route should be tagged as 666 (tag 666)

Answer: A

Question No: 65

Which keyword is used in the syntax to refer to Cisco IOS XR address-family groups, session groups, or neighbor groups?

  1. inherit

  2. apply

  3. use

  4. commit

Answer: C

Question No: 66

Which multicast group range is reserved for SSM?





Answer: C Explanation:

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.

鈥y default, PIM-SSM operates in the 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.

鈥f 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.

鈥o MSDP SA messages within the SSM range are accepted, generated, or forwarded

Question No: 67

Which two specific characteristics categorize traceroute in an IPv6 routing environment? (Choose two.)

  1. Traceroute can show the path to reach any destination IPv6 address.

  2. Traceroute returns an error for a link-local IPv6 address.

  3. Traceroute is based on ICMPv6 Type 1 (Destination Unreachable) reply packets to determine the network path.

  4. Traceroute is based on ICMPv6 Type 3 (Time Exceeded) reply packets to determine the network path.

  5. Traceroute is based on ICMPv6 Type 2 (Packet Too Big) reply packets to determine the network path.

  6. Traceroute for IPv6 implements a backwards compatibility option to provide a detailed report in environments running dual-stack.

Answer: A,D

Question No: 68

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

  1. simplifies the route redistribution policies complexity

  2. requires IPv6-to-IPv4 translation on the uplinks to the service providers

  3. provides built-in support for Kerberos authentication

  4. does not have to worry about NAT traversal

  5. supports multicast properly

Answer: D,E

Question No: 69

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

  1. To enable the router as the candidate RP

  2. To enable the router as the candidate BSR

  3. To enable the router as the BSR mapping agent

  4. To set up an administrative boundary to prevent BSR messages from being sent out through an interface

  5. To define a boundary to restrict the RP discovery and announcement messages from being sent outside the PIM-SM domain

Answer: D

Question No: 70

Refer to the exhibit.

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Which three statements are correct regarding the Cisco IOS-XR configuration? (Choose three.)

  1. This router, acting as the RP mapping agent, will send RP announcement messages to the group

  2. This router, acting as the RP mapping agent, will send RP discovery messages to the group

  3. This router is the RP mapping agent only for the and multicast groups

  4. This router is a candidate PIM-SM RP for the multicast group

  5. This router is a candidate PIM-BIDIR RP for the multicast group

  6. IGMPv3 is enabled on all interfaces

  7. Other routers will recognize this router as the RP for all multicast groups with this router loopback 0 IP address

Answer: D,E,F

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