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2017 Mar 400-101 exam prep

Q201. Where should the passive-interface command be used? 

A. Under the routing process for interfaces that need to be routed, but prevented from peering 

B. under the routing process for interfaces that need to be routed and allowed to peer 

C. under the interface configuration for interfaces that need to be routed, but prevented from peering 

D. under the interface configuration for interfaces that need to be routed and allowed to peer 

E. under the VTY configuration within global configuration mode 

Answer:

Explanation: 

Passive-interface is a feature you enable on a per interface basis which allows a particular interface to participate in a routing process but prevents that interface from forming neighbor relationships by not sending hello packets and discarding received hello packets. 


Q202. Which LSA type is associated with the default route in a totally stubby area? 

A. interarea-prefix LSA for ABRs (Type 3) 

B. autonomous system external LSA (Type 5) 

C. router LSA (Type 1) 

D. interarea-router LSAs for ASBRs (Type 4) 

Answer:


Q203. Which two options are interface requirements for turbo flooding? (Choose two.) 

A. The interface is Ethernet. 

B. The interface is configured for ARPA encapsulation. 

C. The interface is PPP. 

D. The interface is configured for GRE encapsulation. 

E. The interface is configured for 802.1Q encapsulation. 

Answer: A,B 

Explanation: 

In the switch, the majority of packets are forwarded in hardware; most packets do not go through the switch CPU. For those packets that do go to the CPU, you can speed up spanning tree-based UDP flooding by a factor of about four to five times by using turbo-flooding. This feature is supported over Ethernet interfaces configured for ARPA encapsulation. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/metro/me3400/software/release/12-2_50_se/configuration/guide/scg/swiprout.html 


Q204. DRAG DROP 

Drag and drop the DSCP PHB on the left to the corresponding binary representation on the right. 

Answer: 


Q205. DRAG DROP 

Drag and drop the multicast protocol definition on the left to the correct default time interval on the right. 

Answer: 


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Q206. Which two metrics are measured with active probes when PfR voice traffic optimization is in use? (Choose two.) 

A. MOS 

B. cost 

C. jitter 

D. bandwidth 

Answer: A,C 


Q207. 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 


Q208. Refer to the exhibit. 

Your organization has two offices, Site 1 and Site 2, which are connected by a provider 

backbone, as shown. Where must you configure an attachment circuit to allow the two sites to connect over a Layer 2 network using L2TPv3? 

A. PE Site 1 Fa1/0 and PE Site 2 Fa0/0 

B. CE Site 1 Fa0/0 and CE Site 2 Fa0/0 

C. PE Site 1 Se0/0 and PE Site 2 Se0/0 

D. CE Site 1 Fa0/0 and PE Site 2 Se0/0 

Answer:


Q209. Refer to the exhibit. 

Which two route types are advertised by a router with this configuration? (Choose two.) 

A. connected 

B. external 

C. summary 

D. static 

E. redistributed 

Answer: A,C 


Q210. If two OSPF type 3 prefixes have the same metric, and are within the same process, which prefix(es) are installed into the routing table? 

A. The route whose originator has the lower router ID. 

B. Both routes are installed. 

C. The route whose originator has the higher router ID. 

D. The first route that is learned. 

Answer:

Explanation: 

OSPF allows multiple equal-cost paths to the same destination. Since all link-state information is flooded and used in the SPF calculation, multiple equal cost paths can be computed and used for routing, and each route will be installed in the routing table.