Cisco 400-101 ExamCCIE Routing and Switching (v5.0)

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[Download] 400-101 Cisco sample question 451-460 (Mar 2017)

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2017 Mar 400-101 pdf exam

Q451. Refer to the exhibit. 

When the link between RtrB and RtrC goes down, multicast receivers stop receiving traffic from the source for multicast group 229.1.1.1.Which solution will resolve this? 

A. adding a static mroute on RtrB and RtrF 

B. adding a static unicast route on RtrB and RtrF 

C. creating a GRE tunnel between RtrB and RtrD 

D. enabling PIM sparse mode on both ends of the link between RtrB and RtrF 

Answer:

Explanation: 

For multicast traffic to flow, PIM must be enabled on all routers in the path of the multicast stream. 


Q452. Which two features improve BGP convergence? (Choose two.) 

A. next-hop address tracking 

B. additional paths 

C. advertise map 

D. communities 

E. soft reconfiguration 

Answer: A,B 

Explanation: 

The BGP Support for Next-Hop Address Tracking feature is enabled by default when a supporting Cisco software image is installed. BGP next-hop address tracking is event driven. BGP prefixes are automatically tracked as peering sessions are established. Next-hop changes are rapidly reported to the BGP routing process as they are updated in the RIB. This optimization improves overall BGP convergence by reducing the response time to next-hop changes for routes installed in the RIB. When a best path calculation is run in between BGP scanner cycles, only next-hop changes are tracked and processed. BGP routers and route reflectors (RRs) propagate only their best path over their sessions. The advertisement of a prefix replaces the previous announcement of that prefix (this behavior is known as an implicit withdraw). The implicit withdraw can achieve better scaling, but at the cost of path diversity. Path hiding can prevent efficient use of BGP multipath, prevent hitless planned maintenance, and can lead to MED oscillations and suboptimal hot-potato routing. Upon nexthop failures, path hiding also inhibits fast and local recovery because the network has to wait for BGP control plane convergence to restore traffic. The BGP Additional Paths feature provides a generic way of offering path diversity; the Best External or Best Internal features offer path diversity only in limited scenarios. The BGP Additional Paths feature provides a way for multiple paths for the same prefix to be advertised without the new paths implicitly replacing the previous paths. Thus, path diversity is achieved instead of path hiding. 

References: http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-1sg/irg-nexthop-track.html http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/bgp_additional_paths.html 


Q453. Packets from a router with policy-based routing configured are failing to reach the next hop. 

Which two additions can you make to the router configuration to enable the packets to flow correctly? (Choose two.) 

A. Enable ip proxy-arp on the exiting interface. 

B. Specify the next hop as an address. 

C. Specify the next hop as an interface. 

D. Add a match-any permit statement to the route map. 

Answer: A,B 

Explanation: 

Here is an example: 

Router(config)#route-map Engineers permit 20 

Router(config-route-map)#match ip address 2 

Router(config-route-map)#set interface Ethernet1 

Here, instead of specifying a next-hop, it specifies that any packets matching this rule will be forwarded directly out the interface Ethernet1. This means that either the destination device must be on this segment, or there must be a router configured with Proxy ARP that can forward the packet to the ultimate destination. 


Q454. Refer to the exhibit. 

ASN 64523 has a multihomed BGP setup to ISP A and ISP B. Which BGP attribute can you set to allow traffic that originates in ASN 64523 to exit the ASN through ISP B? 

A. origin 

B. next-hop 

C. weight 

D. multi-exit discriminator 

Answer:

Explanation: 

MED is an optional nontransitive attribute. MED is a hint to external neighbors about the preferred path into an autonomous system (AS) that has multiple entry points. The MED is also known as the external metric of a route. A lower MED value is preferred over a higher value. Example at reference link below: 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13759-37.html 


Q455. Refer to the exhibit. 

If the downstream router has a summary route configured, which two actions must you take on the local router to create the summary route that summarizes all routes from the downstream router? (Choose two.) 

A. Configure the summary address on the interface. 

B. Use 10.0.0.0 255.248.0.0 as the summary route. 

C. Configure the summary address in the EIGRP process. 

D. Use 10.0.0.0 255.252.0.0 as the summary route. 

E. Configure a route map to permit the route. 

F. Configure a distribute list in. 

Answer: A,B 

Explanation: 

Route summarization works in conjunction with the ip summary-address eigrp interface configuration command, in which additional summarization can be performed. To correctly summarize all the networks shown, the correct route to use is 10.0.0.0 255.248.0.0 

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


Up to date 400-101 test:

Q456. What are the three HDLC operating modes? (Choose three.) 

A. normal response 

B. asynchronous balanced 

C. synchronous response 

D. asynchronous response 

E. normal balanced 

F. synchronous balanced 

Answer: A,B,D 


Q457. Refer to the exhibit. 

Why is the router not accessible via Telnet on the GigabitEthernet0 management interface? 

A. The wrong port is being used in the telnet-acl access list. 

B. The subnet mask is incorrect in the telnet-acl access list. 

C. The log keyword needs to be removed from the telnet-acl access list. 

D. The access class needs to have the vrf-also keyword added. 

Answer:

Explanation: 

The correct command should be “access-class telnet-acl in vrf-also”. If you do not specify the vrf-also keyword, incoming Telnet connections from interfaces that are part of a VRF are rejected. 


Q458. DRAG DROP 

Drag and drop the VLAN number on the left to the corresponding default VLAN name on the right. 

Answer: 


Q459. Which attribute is not part of the BGP extended community when a PE creates a VPN-IPv4 route while running OSPF between PE-CE? 

A. OSPF domain identifier 

B. OSPF route type 

C. OSPF router ID 

D. MED 

E. OSPF network type 

Answer:

Explanation: 

By process of elimination, from RFC 4577: 

For every address prefix that was installed in the VRF by one of its associated OSPF instances, the PE must create a VPN-IPv4 route in BGP. Each such route will have some of the following Extended Communities attributes: 

– The OSPF Domain Identifier Extended Communities attribute. If the OSPF instance that installed the route has a non-NULL primary Domain Identifier, this MUST be present; if that OSPF instance has only a NULL Domain Identifier, it MAY be omitted. 

– OSPF Route Type Extended Communities Attribute. This attribute MUST be present. It is encoded with a two-byte type field, and its type is 0306. 

– OSPF Router ID Extended Communities Attribute. This OPTIONAL attribute specifies the OSPF Router ID of the system that is identified in the BGP Next Hop attribute. More precisely, it specifies the OSPF Router Id of the PE in the OSPF instance that installed the route into the VRF from which this route was exported. 

– MED (Multi_EXIT_DISC attribute). By default, this SHOULD be set to the value of the OSPF distance associated with the route, plus 1. 

Reference: https://tools.ietf.org/html/rfc4577 


Q460. DRAG DROP 

Drag and drop the events on the left to dispaly the correct sequence on the right when CoPP is enabled. 

Answer: 


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