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CCIE Routing and Switching Written Exam v5.1

QUESTION 621

Which two options are EEM policies? (Choose two.)

 

A.

applets

B.

event detectors

C.

scripts

D.

syslogs

E.

actions

 

Correct Answer: AC

 

QUESTION 622

Refer to the exhibit. Route exchange is failing on a PE edge device configured with this VRF-Lite. Which action can you take to correct the problem?

 

clip_image002

 

A.

Configure the vrf-lite capability under the OSPF address families.

B.

Correct the route descriptors.

C.

Correct the OSPF router-ids.

D.

Configure the control plane with a larger memory allocation to allow the device to appear in the routing table.

 

Correct Answer: A

Explanation:

Open Shortest Path First version 3 (OSPFv3) operates in nondefault VPN routing and forwarding (VRF) instances for both IPv6 and IPv4 address families and, transports the routes across a Border Gateway Protocol (BGP) or a Multiprotocol Label Switching (MPLS) backbone. On the provider edge (PE) device, customer routes are installed together by OSPFv3 and BGP in a common VRF or address family and each protocol is configured to redistribute the routes of the other. BGP combines the prefixes redistributed into it with a route-distinguisher value defined for the VRF and advertises them to other MPLS-BGP speakers in the same autonomous system using the VPNv4 or VPNv6 address family as appropriate.

The OSPFv3 route selection algorithm prefers intra-area routes across the back-door link over inter-area routes through the MPLS backbone. Sham-links are a type of virtual link across the MPLS backbone that connect OSPFv3 instances on different PEs. OSPFv3 instances tunnel protocol packets through the backbone and form adjacencies. Because OSPFv3 considers the sham-link as an intra-area connection, sham-link serves as a valid alternative to an intra-area back-door link.

Domain IDs are used to determine whether the routes are internal or external. They describe the administrative domain of the OSPFv3 instance from which the route originates. Every PE has a 48-bit primary domain ID (which may be NULL) and zero or more secondary domain IDs.

How to Configure VRF-Lite/PE-CE

Configuring a VRF in an IPv6 Address Family for OSPFv3

SUMMARY STEPS

1. enable

2. configure terminal

3. vrf definition vrf-name

4. rd route-distinguisher

5. exit

6. router ospfv3 [process-id]

7. address-family ipv6 [unicast] [vrf vrf-name]

8. end

 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro-15-sy-book/iro-vrf-lite-pe-ce.html

 

 

QUESTION 623

Which three modes are valid for forming an EtherChannel between the ports of two switches? (Choose three.)

 

A.

Active/active

B.

Active/passive

C.

Passive/passive

D.

Auto/auto

E.

Auto/desirable

F.

Desirable/on< /font>

 

Correct Answer: ABE

Explanation:

To configure an EtherChannel using LACP negotiation, each side must be set to either active or passive; only interfaces configured in active mode will attempt to negotiate an EtherChannel. Passive interfaces merely respond to LACP requests. PAgP behaves the same, but its two modes are refered to as desirable and auto.

 

clip_image003

 

Reference: http://packetlife.net/blog/2010/jan/18/etherchannel-considerations/

QUESTION 624

Which two statements about BGP loop prevention are true? (Choose two.)

 

A.

Advertisements from PE routers with per-neighbor SOO configured include a Site of Origin value that is equal to the configured value of the BGP peering.

B.

If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop.

C.

AS-override aids BGP loop prevention, but alternate loop prevention mechanisms are also necessary.

D.

Advertisements from the neighbors a BGP peering include a Site of Origin value that is separate from the configured value of the BGP peering.

E.

If the configured Site of Origin value of a BGP peering is greater than the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop.

F.

If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is permitted.

 

Correct Answer: AB

 

 

QUESTION 625

Which two commands enable OSPF graceful shutdown? (Choose two.)

 

A.

nsf cisco

B.

ip ospf shutdown

C.

shutdown

D.

nsf ietf helper disable

 

Correct Answer: BC

 

 

QUESTION 626

DRAG DROP

Drag and drop the TACACS+ configuration command on the left to the correct function it performs on the right.

 

clip_image005

 

Correct Answer:

clip_image007

 

 

QUESTION 627

Refer to the exhibit. Which two options are effects of the given configuration? (Choose two.)

 

clip_image008

 

A.

It sets the data export destination to 209.165.200.227 on UDP port 49152.

B.

It enables Cisco Express Forwarding on interface FastEthernet0/0.

C.

It configures the export process to include the BGP peer AS of the router gathering the data.

D.

It enables NetFlow switching on interface FastEthernet0/0.< /font>

E.

It sets the data export destination to 209.165.200.227 on TCP port 49152.

 

Correct Answer: AD

Explanation:

The “ip flow-export destination 209.165.200.227 49152” command specifies that the data export destination server is 209.165.200.227 using UDP port 49152.

The “ip route-cache flow” command under the fastethernet 0/0 interface enable netflow switching on that interface.

 

 

QUESTION 628

Which two protocols does the Management Plane Protection feature support? (Choose two.)

 

A.

ARP

B.

HTTPS

C.

TFTP

D.

OSPF

 

Correct Answer: BC

 

 

QUESTION 629

Which three features does GETVPN support to improve deployment and scalability? (Choose three.)

 

A.

configuration of multiple key servers to work cooperatively

B.

allowing traffic to be discarded until a group member registers successfully

C.

local exceptions in the traffic classification ACL

D.

GDOI protocol configuration between group members and the key server

E.

redundant IPsec tunnels between group members and the key server

F.

redundant multicast replication streaming through the use of a bypass tunnel

 

Correct Answer: AEF

 

 

QUESTION 630

Which data plane protocol does EIGRP Over the Top use?

 

A.

MPLS

B.

GRE

C.

LISP

D.

IP-in-IP

 

Correct Answer: C

Explanation:

The EIGRP Over the Top solution can be used to ensure connectivity between disparate Enhanced Interior Gateway Routing Protocol (EIGRP) sites. This feature uses EIGRP on the control plane and Locator ID Separation Protocol (LISP) encapsulation on the data plane to route traffic across the underlying WAN architecture. EIGRP is used to distribute routes between customer edge (CE) devices within the network, and the traffic forwarded across the WAN architecture is LISP encapsulated. Therefore, to connect disparate EIGRP sites, you must configure the neighbor command with LISP encapsulation on every CE in the network.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-3s/ire-xe-3s-book/ire-eigrp-over-the-top.html

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