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Q11. Which two statements are true about IPv6 multicast? (Choose two.) 

A. Receivers interested in IPv6 multicast traffic use IGMPv6 to signal their interest in the IPv6 multicast group. 

B. The PIM router with the lowest IPv6 address becomes the DR for the LAN. 

C. An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8. 

D. The IPv6 all-routers multicast group is FF02:0:0:0:0:0:0:2. 

Answer: C,D 

Explanation: 

Multicast addresses in IPv6 have the prefix ff00::/8. 

Well-known IPv6 multicast addresses 

Address 

Description 

ff02::1 

All nodes on the local network segment 

ff02::2 

All routers on the local network segment 

Reference: http://en.wikipedia.org/wiki/Multicast_address 


Q12. Which two options are disadvantages of a commingled dual-tier WAN rate-based Ethernet circuit? (Choose two.) 

A. It requires the maintenance of separate chassis. 

B. It has limited scalability. 

C. It requires additional CPU resources at the subscriber end. 

D. It is more difficult to secure. 

E. It can increase the likelihood of packet drops. 

Answer: A,E 


Q13. What are three required commands when you enable source-specific multicast for addresses in the range 233.0.0.0/8? (Choose three.) 

A. ip multicast-routing 

B. ip igmp version 3 

C. ip pim ssm-range 233.0.0.0/8 

D. ip igmp version 2 

E. ip pim ssm-range default 

F. set routing-options multicast ssm-groups 233.0.0.0/8 

Answer: A,B,C 


Q14. Refer to the exhibit. 

Which statement is true about a valid IPv6 address that can be configured on tunnel interface0? 

A. There is not enough information to calculate the IPv6 address. 

B. 6to4 tunneling allows you to use any IPv6 address. 

C. 2001:7DCB:5901::/128 is a valid IPv6 address. 

D. 2002:7DCB:5901::/128 is a valid IPv6 address. 

Answer:

Explanation: 

Most IPv6 networks use autoconfiguration, which requires the last 64 bits for the host. The first 64 bits are the IPv6 prefix. The first 16 bits of the prefix are always 2002:, the next 32 bits are the IPv4 address, and the last 16 bits of the prefix are available for addressing multiple IPv6 subnets behind the same 6to4 router. Since the IPv6 hosts using autoconfiguration already have determined the unique 64 bit host portion of their address, they must simply wait for a Router Advertisement indicating the first 64 bits of prefix to have a complete IPv6 address. A 6to4 router will know to send an encapsulated packet directly over IPv4 if the first 16 bits are 2002, using the next 32 as the destination, or otherwise send the packet to a well-known relay server, which has access to native IPv6. 

Reference: http://en.wikipedia.org/wiki/6to4 


Q15. DRAG DROP 

Drag and drop the NHRP flag on the left to the corresponding meaning on the right. 

Answer: 


Q16. When BGP route reflectors are used, which attribute ensures that a routing loop is not created? 

A. weight 

B. local preference 

C. multiexit discriminator 

D. originator ID 

Answer:

Explanation: 

As the iBGP learned routes are reflected, routing information may loop. The route reflector model has the following mechanisms to avoid routing loops: 

. Originator ID is an optional, nontransitive BGP attribute. It is a 4-byte attributed created by a route reflector. The attribute carries the router ID of the originator of the route in the local autonomous system. Therefore, if a misconfiguration causes routing information to come back to the originator, the information is ignored. 

. Cluster-list is an optional, nontransitive BGP attribute. It is a sequence of cluster IDs that the route has passed. When a route reflector reflects a route from its clients to nonclient peers, and vice versa, it appends the local cluster ID to the cluster-list. If the cluster-list is empty, a new cluster-list is created. Using this attribute, a route reflector can identify if routing information is looped back to the same cluster due to misconfiguration. If the local cluster ID is found in the cluster-list, the advertisement is ignored. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfbgp.html 


Q17. Which two statements about BGP prefix-based outbound filtering are true? (Choose two.) 

A. It must be configured per address family. 

B. It can use prefix lists and route maps for filtering. 

C. It can be configured under the global BGP routing process. 

D. It can be configured for external peering sessions only. 

E. It can increase the processing load on the router. 

F. It supports IP multicast routes. 

Answer: A,D 


Q18. Refer to the exhibit. 

Which two commands are required on R3 in order for MPLS to function? (Choose two.) 

A. mpls ip 

B. ip cef 

C. mpls label protocol tdp 

D. mpls ip propagate-ttl 

Answer: A,B 


Q19. 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? 

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. 

Answer:

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 


Q20. In which way does the Bridge Assurance mechanism modify the default spanning-tree behavior in an effort to prevent bridging loops? 

A. Received BPDUs are looped back toward the sender to ensure that the link is bidirectional. 

B. If BPDUs are no longer received on a port, the switch immediately sends out a TCN BPDU. 

C. Extended topology information is encoded into all BPDUs. 

D. BPDUs are sent bidirectional on all active network ports, including blocked and alternate ports. 

Answer: