NEW QUESTION 1
An SP core is running PIM on the network. Multicast groups in this networkare in the 232.0.0.0/8 range. Which commandenables multicast routing operations without using an RP?

• A. ip pim autorp
• B. ip pim ssm default
• C. ip pim bidir-enable
• D. ip pim register-source

Answer: B

NEW QUESTION 2
In Cisco IOS-XR, the maximum-prefix command, to control the number of prefixes that can be installed from a BGP neighbor, is configured under which configuration mode?

• A. RP/0/RSP0/CPU0:P2(config-bgp)#
• B. RP/0/RSP0/CPU0:P2(config-bgp-af)#
• C. RP/0/RSP0/CPU0:P2(config-bgp-nbr)#
• D. RP/0/RSP0/CPU0:P2(config-bgp-nbr-af)#

Answer: D

Explanation:
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801 0a28a.shtml

NEW QUESTION 3
A CRS router that runs Cisco IOS XR has dual routing processors installed. Which solution should be implemented to prevent OSPF adjacency flapping if the primary routing processor fails?

• A. NSR
• B. OSPF Fast Timers
• C. OSPF RE Sync
• D. router msdp
• E. NSF

Answer: A

NEW QUESTION 4
Refer to the exhibit.




Which two statements are correct regarding the multicast operations on the router that is the RP? (Choose two.)

• A. It is using IGMPv3
• B. The IGMP query interval is set to 125 seconds
• C. It is using the IPv4 unicast routing table to perform the RPF checks
• D. Static multicast routes are configured on the RP

Answer: AC

Explanation:
#show ip mroute
#show ip pim interface
#show ip igmp group
#show ip pim neighbor

NEW QUESTION 5
To which three IP multicast groups can a multicast MAC address "01-00-5E-4D-62-B1" listen? (Choose three.)

• A. 231.205.98.177
• B. 231.205.99.177
• C. 239.77.98.177
• D. 239.205.99.177
• E. 224.205.98.177
• F. 224.205.99.177

Answer: ACE

NEW QUESTION 6
Refer to the exhibit.




On the PE5 router, which statementis correct regarding the learned BGP prefixes?

• A. The 209.165.201.0/27 prefix is received from the 10.0.1.1 IBGP peer which is a route reflector
• B. The 172.16.66.0/24 prefix BGP next-hop points to the route reflector
• C. All prefixes learned on PE5 has the default local preference value
• D. The 209.165.202.128/27 prefix is originated by the 10.0.1.1 IBGP peer

Answer: C

Explanation:
#show ip bgp -- check i tag for PE5

NEW QUESTION 7
Refer to the exhibit.

The following multicast IP addresses map to which multicast MAC address?

• A. 01:00:5E:8A:00:01
• B. 01:00:5E:0A:00:01
• C. 01:00:5E:7A:00:01
• D. 01:00:5E:05:00:01

Answer: B

NEW QUESTION 8
Which statement is correct regarding using the TTL threshold to define the delivery boundaries of multicast traffic?

• A. If a packet TTL is less than the specified TTL threshold, the packet is forwarded out of the interface
• B. If a packet TTL is greater or equal to the specified TTL threshold, the packet is forwarded out of the interface
• C. If a packet TTL is equal to the specified TTL threshold, the packet is dropped
• D. When a multicast packet arrives, the TTL threshold value is decremented by 1. If the resulting TTL threshold value is greater than or equal to 0, the packet is dropped

Answer: B

NEW QUESTION 9
Which type of DNS record is used for IPv6 forward lookups?

• A. A records
• B. AAAA records
• C. PTR records
• D. MX records

Answer: B

NEW QUESTION 10
Which keyword is used in the syntax to refer to Cisco IOS XR address-family groups, session groups, or neighbor groups?

• A. inherit
• B. apply
• C. use
• D. commit

Answer: C

NEW QUESTION 11
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

Answer: B

NEW QUESTION 12
With PIM-SM operations, which four pieces of information are maintained in the multicast routing table for each (*,G) or (S,G) entry? (Choose four.)

• A. RPF Neighbor
• B. RP Set
• C. Incoming Interface
• D. OIL
• E. DF priority
• F. PIM SM state flags

Answer: ACDF

Explanation:
The following is sample output from the show ip mroute command for a router operating in sparse mode:
show ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned R - RP-bit set, F - Register flag, T - SPT-bit set
Timers: Uptime/Expires
Interface state: Interface, Next-Hop, State/Mode
(*, 224.0.255.3), uptime 5:29:15, RP is 198.92.37.2, flags: SC
Incoming interface: Tunnel0, RPF neighbor 10.3.35.1, Dvmrp Outgoing interface list:
Ethernet0, Forward/Sparse, 5:29:15/0:02:57
(198.92.46.0/24, 224.0.255.3), uptime 5:29:15, expires 0:02:59, flags: C
Incoming interface: Tunnel0, RPF neighbor 10.3.35.1 Outgoing interface list:
Ethernet0, Forward/Sparse, 5:29:15/0:02:57

NEW QUESTION 13
Refer to the exhibit.

Which configuration is missing to complete the configuration task of enabling BFD with the 192.168.1.1 EBGP peer?

• A. bfd fast-detect also needs to be enabled globally under router bgp 64500 RP/0/RSP0/CPU0:P1(config-bgp)#bfd fast-detect
• B. bfd fast-detect also needs to be enabled for the address-family under address-family ipv4 unicastRP/0/RSP0/CPU0:P1(config-bgp-af)#bfd fast-detect
• C. bfd fast-detect also needs to be enabled for the 192.168.1.1 neighbor under neighbor 192.168.1.1RP/0/RSP0/CPU0:P1(config-bgp-nbr)#bfd fast-detect
• D. bfd fast-detect also needs to be enabled for the 192.168.1.1 neighbor address-family under neighbor 192.168.1.1 address-family ipv4 unicastRP/0/RSP0/CPU0:P1(config-bgp-nbr-af)#bfd fast-detect
• E. bfd fast-detect also needs to be enabled globally on the router RP/0/RSP0/CPU0:P1(config)#bfd fast-detect

Answer: C

NEW QUESTION 14
Refer to the exhibit.

Given the partial BGP configuration, which configuration correctly completes the Cisco IOS-XR route reflector configuration where both the 1.1.1.1 and 2.2.2.2 routers are the clients and the 3.3.3.3 router is a non-client IBGP peer?

• A. neighbor 1.1.1.1remote-as 65123 route-reflector-client neighbor 2.2.2.2remote-as 65123 route-reflector-client neighbor 3.3.3.3remote-as 65123
• B. neighbor 1.1.1.1 address-family ipv4 unicast remote-as 65123route-reflector-client neighbor 2.2.2.2address-family ipv4 unicast remote-as 65123route-reflector-client neighbor 3.3.3.3address-family ipv4 unicast remote-as 65123
• C. neighbor 1.1.1.1remote-as 65123address-family ipv4 unicast route-reflector-client neighbor 2.2.2.2remote-as 65123address-family ipv4 unicast route-reflector-client neighbor 3.3.3.3remote-as 65123
• D. neighbor 1.1.1.1 remote-as 65123neighbor 1.1.1.1 route-reflector-clientneighbor 2.2.2.2 remote-as 65123neighbor 2.2.2.2 route-reflector-clientneighbor 3.3.3.3 remote-as 65123

Answer: C

NEW QUESTION 15
Which statement is correct regarding MP-BGP?

• A. MP-BGP can indicate whether an advertised prefix (NLRI) is to be used for unicast routing, multicast RPF checks or for both using different SAFIs.
• B. MP-BGP uses a single BGP table to maintain all the unicast prefixes for unicast forwarding and all the unicast prefixes for RPF checks.
• C. MP-BGP can be used to propagate multicast state information, which eliminates the need to use PIM for building the multicast distribution trees.
• D. MP-BGP enables BGP to carry IP multicast routes used by MSDP to build the multicast distribution trees.

Answer: A

Explanation:
Protocol Independent Multicast
Protocol Independent Multicast (PIM) is a routing protocol designed to send and receive multicast routing updates. Proper operation of multicast depends on knowing the unicast paths towards a source or an RP. PIM relies on unicast routing protocols to derive this reverse-path forwarding (RPF) information. As the name PIM implies, it functions independently of the unicast protocols being used. PIM relies on the Routing Information Base (RIB) for RPF information. If the multicast subsequent address family identifier (SAFI) is configured for Border Gateway Protocol (BGP), or if multicast intact is configured, a separate multicast unicast RIB is created and populated with the BGP multicast SAFI routes, the intact information, and any IGP information in the unicast RIB. Otherwise, PIM gets information directly from the unicast SAFI RIB. Both multicast unicast and unicast databases are outside of the scope of PIM.
The Cisco IOS XR implementation of PIM is based on RFC 4601 Protocol Independent Multicast - Sparse
Mode (PIM-SM): Protocol Specification. For more information, see RFC 4601 and the Protocol Independent Multicast (PIM): Motivation and Architecture Internet Engineering Task Force (IETF) Internet draft

NEW QUESTION 16
When enabling interdomain multicast routing, which two statements are correct? (Choose two.)

• A. Multiprotocol BGP is used instead of PIM SM to build the intradomain and interdomain multicast distribution trees
• B. Use MSDP to enable the RPs from different domains to exchange information about active multicast sources
• C. MSDP SA packets are sent between the multiprotocol BGP peers
• D. Noncongruent unicast and multicast topologies can be supported using multiprotocol BGP

Answer: BD

Explanation:
http://prakashkalsaria.wordpress.com/2010/08/11/mbgp-msdp/
MSDP In the PIM-SM model, multicast sources and receivers must register with their local RP. Actually, the router closest to the sources or receivers registers with the RP, but the key point to note is that the RP knows about all the sources and receivers for any particular
group. RPs in other domains have no way of knowing about sources located in other domains. MSDP is an elegant way to solve this problem.
MSDP is a mechanism that allows RPs to share information about active sources. RPs know about the receivers in their local domain. When RPs in remote domains hear about the active sources, they can pass on that information to their local receivers and multicast data can then be forwarded between the domains. A useful feature of MSDP is that it allows each domain to maintain an independent RP that does not rely on other domains, but it does enable RPs to forward traffic between domains. PIM-SM is used to forward the traffic between the multicast domains.
The RP in each domain establishes an MSDP peering session using a TCP connection with the RPs in other domains or with border routers leading to the other domains. When the RP learns about a new multicast source within its own domain (through the normal PIM register mechanism), the RP encapsulates the first data packet in a Source-Active (SA) message and sends the SA to all MSDP peers. The SA is forwarded by each receiving peer using a modified RPF check, until the SA reaches every MSDP router in the interconnected networks—theoretically the entire multicast internet. If the receiving MSDP peer is an RP, and the RP has a (*, G) entry for the group in the SA (there is an interested receiver), the RP creates (S, G) state for the source and joins to the shortest path tree for the source. The encapsulated data is decapsulated and forwarded down the shared tree of that RP. When the packet is received by the last hop router of the receiver, the last hop router also may join the shortest path tree to the source. The MSDP speaker periodically sends SAs that include all sources within the own domain of the RP
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.2/routing/configuration/guide/rc32bgp.html
Multiprotocol BGP
Multiprotocol BGP is an enhanced BGP that carries routing information for multiple network layer protocols and IP multicast routes. BGP carries two sets of routes, one set for unicast routing and one set for multicast routing.
The routes associated with multicast routing are used by the Protocol Independent Multicast (PIM) feature to build data distribution trees.
Multiprotocol BGP is useful when you want a link dedicated to multicast traffic, perhaps to limit which resources are used for which traffic. Multiprotocol BGP allows you to have a unicast routing topology different from a multicast routing topology providing more control over your network and resources.
In BGP, the only way to perform interdomain multicast routing was to use the BGP infrastructure that was in place for unicast routing. Perhaps you want all multicast traffic exchanged at one network access point (NAP).
If those routers were not multicast capable, or there were differing policies for which you wanted multicast traffic to flow, multicast routing could not be supported without multiprotocol BGP.
Note It is possible to configure BGP peers that exchange both unicast and multicast network layer reachability information (NLRI), but you cannot connect multiprotocol BGP clouds with a BGP cloud. That is, you cannot redistribute multiprotocol BGP routes into BGP.

NEW QUESTION 17
Which command set is used to configure BFD support for a BGP neighbor that is reachable through GigabitEthernet 0/0/0/0 on Cisco IOS XR?

• A. router bgp 300 bfd multiplier 2bfd minimum-interval 20neighbor 10.20.20.2remote-as 200
• B. router bgp 300 bfd multiplier 2bfd minimum-interval 20neighbor 10.20.20.2remote-as 200 bfd fast-detect
• C. bfdecho disable router bgp 300neighbor 10.20.20.2remote-as 200
• D. bfdrouter bgp 300neighbor 10.20.20.2remote-as 200
• E. interface Gi0/0/0/0ipv4 verify unicast source reachable-via rx router bgp 300bfd multiplier 2bfd minimum-interval 20neighbor 10.20.20.2remote-as 200 bfd fast-detect
• F. interface Gi0/0/0/0ipv4 verify unicast source reachable-via rx bfdinterface Gi0/0/0/0 echo disable router bgp 300bfd multiplier 2bfd minimum-interval 20neighbor 10.20.20.2remote-as 200

Answer: B

NEW QUESTION 18
Refer to the EBGP configuration on a PE IOS-XR router exhibit.
After the EBGP configuration, no routes are accepted from the EBGP peer, nor are any routes advertised to the EBGP peer.

What could be the problem?

• A. The update-source neighbor configuration command must also be configured
• B. The next-hop-self neighbor configuration command must also be configured
• C. EBGP neighbors must have an inbound and outbound route policy configured
• D. An access list is blocking IP protocol 179 packets between the two EBGP peers
• E. The maximum-prefix neighbor configuration command must also be configured

Answer: C

NEW QUESTION 19
Refer to the Cisco IOS-XR BGP configuration exhibit.

Identify two configuration errors. (Choose two.)

• A. The neighbor-group efg is missing the ebgp-multihop 2 configuration
• B. The ttl-security configuration command is missing the option to set the number of hops
• C. The passall route policy is wrong
• 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
• E. The maximum-prefix 10 configuration should be configured under the af-group abc instead of the neighbor-group efg

Answer: CE

Explanation:
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801 0a28a.shtml

NEW QUESTION 20
A network architect is responsible for the company's multicast network domain design. Which multicast component acts as a meeting place for sources and receivers?

• A. multicast shared tree
• B. multicast distribution point
• C. multicast rendezvous point
• D. multicast source tree

Answer: C

NEW QUESTION 21
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