Ensurepass

QUESTION 71

DRAG DROP

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Correct Answer:

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QUESTION 72

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

 

Correct Answer: D

Explanation:

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

All-nodes multicast group FF02:0:0:0:0:0:0:1 (scope is link-local)

Solicited-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 73

Referring to the topology diagram show in the exhibit, which three statements are correct regarding the BGP routing updates? (Choose three.)

 

clip_image006

 

A.

The EBGP routing updates received by R1 from R5 will be propagated to the R2, R4, and R7 routers

B.

The EBGP routing updates received by R3 from R6 will be propagated to the R2 and R4 routers

C.

The EBGP routing updates received by R1 from R5 will be propagated to the R2 and R4 routers

D.

The IBGP routing updates received by R3 from R2 will be propagated to the R6 router

E.

The IBGP routing updates received by R2 from R1 will be propagated to the R3 router

F.

The IBGP routing updates received by R1 from R4 will be propagated to the R5, R7, and R2 routers

 

Correct Answer: ABD

 

 

QUESTION 74

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.< /p>

OSPF Fast Timers

C.

OSPF RE Sync

D.

router msdp

E.

NSF

Correct Answer: A

 

 

QUESTION 75

After configuring the tunnel interface as shown in the exhibit, no IPv6 traffic is passed over the IPv4 network. Which additional configuration is required to pass the IPv6 traffic over the IPv4 network?

 

clip_image008

 

A.

Configure an IPv4 address on the tunnel0 interface

B.

Configure an IPv6 static route to send the required IPv6 traffic over the tunnel0 interface

C.

The tunnel destination should be pointing to an IPv6 address instead of an IPv4 address

D.

The tunnel0 interface IPv6 address must use the 2002:://16 prefix

 

Correct Answer: B

 

 

QUESTION 76

Which two options are characteristics ofconfiguration templates used by Cisco IOS XRto optimize BGP peering implementations? (Choose two.)

 

A.

Session groups are
used to inherit address family-specific configurations.

B.

Cisco IOS XR provides by default a session group operating with all the supported address families.

C.

Session groups are used to inherit address family-independent configurations.

D.

Session groups can be included within a neighbor group.

E.

Session groups can include neighbor groups.

 

Correct Answer: CD

 

 

QUESTION 77

Which multicast routing protocol is most optimal for supporting many-to-many multicast applications?

 

A.

PIM-SM

B.

PIM-BIDIR

C.

MP-BGP

D.

DVMRP

E.

MSDP

 

Correct Answer: B

Explanation:

PIM-Bidirectional Operations

PIM Bidirectional (BIDIR) has one shared tree from sources to RP and from RP to receivers. This is unlike the PIM-SM, which is unidirectional by nature with multiple source trees – one per (S, G) or a shared tree from receiver to RP and multiple SG trees from RP to sources.

Benefits of PIM BIDIR are as follows:

clip_image010As many sources for the same group use one and only state (*, G), only minimal states are required in each router.

clip_image010[1]No data triggered events.

clip_image010[2]Rendezvous Point (RP) router not required. The RP address only needs to be a routable address and need not exist on a physical device.

 

 

QUESTION 78

Which mechanism is used by an IPv6 multicast receiver to join an IPv6 multicast group?

 

A.

IGMP report

B.

IGMP join

C.

MLD report

D.

General query

E.

PIM join

 

Correct Answer: C

Explanation:

MLD Reports

The processing of MLDv1 join messages is essentially the same as with IGMPv2. When no IPv6 multicast routers are detected in a VLAN, reports are not processed or forwarded from the switch.

When IPv6 multicast routers are detected and an MLDv1 report is received, an IPv6 multicast group address and an IPv6 multicast MAC address are entered in the VLAN MLD database. Then all IPv6 multicast traffic to the group within the VLAN is forwarded using this address. When MLD snooping is disabled, reports are flooded in the ingress VLAN.

When MLD snooping is enabled, MLD report suppression, called listener message suppression, is automatically enabled. With report suppression, the switch forwards the first MLDv1 report received by a group to IPv6 multicast routers; subsequent reports for the group are not sent to the routers. When MLD snooping is disabled, report suppression is disabled, and all MLDv1 reports are flooded to the ingress VLAN. The switch also supports MLDv1 proxy reporting. When an MLDv1 MASQ is received, the switch responds with MLDv1 reports for the address on which the query arrived if the group exists in the switch on another port and if the port on which the query arrived is not the last member port for the address.

 

 

QUESTION 79

Which two actions result when a network administrator attempts to ping an IPv6 host on the LAN? (Choose two.)

 

A.

ARP is used to determine the MAC address of the destination host.

B.

Neighbor Discovery is used to determine the MAC address of the destination host.

C.

Neighbor Solicitation messages are sent out by the source host to determine the data link-layer address of the destination host.

D.

Neighbor Advertisement messages are sent by the source host to announce its presence on the local link.

E.

Router Solicitation messages are sent out on a specific multicast address to request the data link-layer address of the target device.

F.

Router Solicitation messages are sent to the local router on the network segment to request data link-layer information about the destination host.

 

Correct Answer: BC

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QUESTION 80

Which three methods can be used to reduce the full-mesh IBGP requirement in a service provider core network? (Choose three.)

 

A.

Implement route reflectors

B.

Enable multi-protocol BGP sessions between all the PE routers

C.

Implement confederations

D.

Implement MPLS (LDP) in the core network on all the PE and P routers

E.

Enable BGP synchronization

F.

Disable the IBGP split-horizon rule

 

Correct Answer: ACD

 

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