400-101 Guide

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  • Cisco
  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
  • 911 Q&As
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  • Jun 18,2018
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latest ccie r&s dumps (491 to 500)

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2016 Dec ccie written dumps 400-101:

Q491. MPLS LDP IGP synchronization is configured on a link. The OSPF adjacency on that link is UP but MPLS LDP synchronization is not achieved. Which statement about this scenario is true? 

A. The router excludes the link from its OSPF LSA type 1. 

B. The router flushes its own router LSA. 

C. The router advertises the link in its router LSA with max-metric. 

D. The router advertises an LSA type 2 for this link, with the metric set to max-metric. 

E. The router advertises the link and OSPF adjacency as it would when the synchronization is achieved. 

Answer:

Explanation: 

To enable LDP-IGP Synchronization on each interface that belongs to an OSPF or IS-IS process, enter the mpls ldp sync command. If you do not want some of the interfaces to have LDP-IGP Synchronization enabled, issue the no mpls ldp igp sync command on those interfaces. If the LDP peer is reachable, the IGP waits indefinitely (by default) for synchronization to be achieved. To limit the length of time the IGP session must wait, enter the mpls ldp igp sync holddown command. If the LDP peer is not reachable, the IGP establishes the adjacency to enable the LDP session to be established. When an IGP adjacency is established on a link but LDP-IGP Synchronization is not yet achieved or is lost, the IGP advertises the max-metric on that link. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsldpsyn.html 


Q492. How is the MRU for a multilink bundle determined? 

A. It is negotiated by LCP. 

B. It is manually configured on the multilink bundle. 

C. It is manually configured on all physical interfaces of a multilink bundle. 

D. It is negotiated by NCP. 

E. It is negotiated by IPCP. 

Answer:


Q493. DRAG DROP 

Drag and drop the argument of the ip cef load-sharing algorithm command on the left to the function it performs on the right. 

Answer: 


Q494. Which two statements about 802.1Q tunneling are true? (Choose two.) 

A. It requires a system MTU of at least 1504 bytes. 

B. The default configuration sends Cisco Discovery Protocol, STP, and VTP information. 

C. Traffic that traverses the tunnel is encrypted. 

D. It is supported on private VLAN ports. 

E. MAC-based QoS and UDLD are supported on tunnel ports. 

F. Its maximum allowable system MTU is 1546 bytes. 

Answer: A,E 


Q495. Which command do you use to connect a dense-mode domain to a sparse-mode multicast domain? 

A. none, because there is no such command 

B. ip pim spt-threshold infinity 

C. ip pim register dense-mode 

D. ip pim dense-mode proxy-register 

Answer:

Explanation: 

For IP PIM multicast, Cisco recommends Sparse-Mode over Dense-Mode. In the midst of our network migration, we have a new network operating in Sparse-Mode with Anycast rendezvous point (RP) but our existing network is still operating in Dense-Mode. To bridge two different modes across both PIM domains, we should use the ip pim dense-mode proxy-register command on the interface leading toward the bordering dense mode region. This configuration will enable the border router to register traffic from the dense mode region (which has no concept of registration) with the RP in the sparse mode domain. 

Reference: http://networkerslog.blogspot.com/2010/12/bridging-dense-mode-pim-to-sparse-mode.html 


Improve cisco 400-101:

Q496. Which two options describe two functions of a neighbor solicitation message? (Choose two.) 

A. It requests the link-layer address of the target. 

B. It provides its own link-layer address to the target. 

C. It requests the site-local address of the target. 

D. It provides its own site-local address to the target. 

E. It requests the admin-local address of the target. 

F. It provides its own admin-local address to the target. 

Answer: A,B 

Explanation: 

Neighbor solicitation messages are sent on the local link when a node wants to determine the link-layer address of another node on the same local link (see the figure below). When a node wants to determine the link-layer address of another node, the source address in a neighbor solicitation message is the IPv6 address of the node sending the neighbor solicitation message. The destination address in the neighbor solicitation message is the solicited-node multicast address that corresponds to the IPv6 address of the destination node. The neighbor solicitation message also includes the link-layer address of the source node. 

Figure 1. IPv6 Neighbor Discovery: Neighbor Solicitation Message 

After receiving the neighbor solicitation message, the destination node replies by sending a neighbor advertisement message, which has a value of 136 in the Type field of the ICMP packet header, on the local link. The source address in the neighbor advertisement message is the IPv6 address of the node (more specifically, the IPv6 address of the node interface) sending the neighbor advertisement message. The destination address in the neighbor advertisement message is the IPv6 address of the node that sent the neighbor solicitation message. The data portion of the neighbor advertisement message includes the link-layer address of the node sending the neighbor advertisement message. After the source node receives the neighbor advertisement, the source node and destination node can communicate. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-3s/ip6b-xe-3s-book/ip6-neighb-disc-xe.html 


Q497. DRAG DROP 

Drag and drop Layer 2 QoS Commands on the left to the corresponding functions on the right. 

Answer: 


Q498. Which two statements about OSPF default route injection are true? (Choose two.) 

A. The ABR requires manual configuration to send a default route into an NSSA area. 

B. The ABR injects a default route into a Totally Stub Area. 

C. In a stub area, the ASBR generates a summary LSA with link-state ID 0.0.0.0. 

D. If the default route is missing from the routing table, the ASBR can use the default-information originate command to advertise the default into the OSPF domain. 

E. By default, OSPF normal areas will generate default routes into the routing domain if a default route exists. 

Answer: A,B 


Q499. Refer to the exhibit. 

What is a reason for the RIB-failure? 

A. CEF is not enabled on this router. 

B. The route 10.100.1.1/32 is in the routing table, but not as a BGP route. 

C. The routing table has yet to be updated with the BGP route. 

D. The BGP route is filtered inbound and hence is not installed in the routing table. 

Answer:

Explanation: 

A rib-failure occurs when BGP tries to install the bestpath prefix into the RIB, but the RIB rejects the BGP route because a route with better administrative distance already exists in the routing table. An inactive Border Gateway Protocol (BGP) route is a route that is not installed in the RIB, but is installed in the BGP table as rib-failure. Example Topology Router 1 (R1) and router 2 (R2) have two parallel links; one links runs BGP AS 65535 and the other link runs Enhanced Interior Gateway Routing Protocol (EIGRP) AS 1. Both BGP and EIGRP are advertising the network 10.1.1.1/32 on R1. 

R2 learns about the 1.1.1.1/32 route through both EIGRP and BGP, but installs only the EIGRP route in the routing table because of the lower administrative distance. Since the BGP route is not installed in the R2 routing table, the route appears as a rib-failure in the R2 BGP table. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/116146-config-bgp-next-hop-00.html 


Q500. Which option describes how a VTPv3 device responds when it detects a VTPv2 device on a trunk port? 

A. It sends VTPv3 packets only. 

B. It sends VTPv2 packets only. 

C. It sends VTPv3 and VTPv2 packets. 

D. It sends a special packet that contains VTPv3 and VTPv2 packet information. 

Answer:

Explanation: 

When a VTP version 3 device on a trunk port receives messages from a VTP version 2 device, the VTP version 3 device sends a scaled-down version of the VLAN database on that particular trunk in a VTP version 2 format. A VTP version 3 device does not send out VTP version 2-formatted packets on a trunk port unless it first receives VTP version 2 packets on that trunk. If the VTP version 3 device does not receive VTP version 2 packets for an interval of time on the trunk port, the VTP version 3 device stops transmitting VTP version 2 packets on that trunk port. Even when a VTP version 3 device detects a VTP version 2 device on a trunk port, the VTP version 3 device continues to send VTP version 3 packets in addition to VTP version 3 device 2 packets, to allow two kinds of neighbors to coexist on the trunk. VTP version 3 sends VTP version 3 and VTP version 2 updates on VTP version 2-detected trunks. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/vtp.html 


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