It is impossible to pass Cisco ccie 400 101 exam without any help in the short term. Come to Exambible soon and find the most advanced, correct and guaranteed Cisco ccie 400 101 practice questions. You will get a surprising result by our Regenerate CCIE Routing and Switching (v5.0) practice guides.

Q91. Which three options must be configured when deploying OSPFv3 for authentication? (Choose three.) 

A. security parameter index 

B. crypto map 

C. authentication method 

D. IPsec peer 

E. encryption algorithm 

F. encryption key 

G. IPsec transform-set 

H. authentication key 

Answer: A,C,H 


Q92. Refer to the exhibit. 

R2 is mutually redistributing between EIGRP and BGP. 

Which configuration is necessary to enable R1 to see routes from R3? 

A. The R3 configuration must include ebgp-multihop to the neighbor statement for R2. 

B. The R2 BGP configuration must include bgp redistribute-internal. 

C. R1 must be configured with next-hop-self for the neighbor going to R2. 

D. The AS numbers configured on R1 and R2 must match. 

Answer:

Explanation: 

Whenever you redistribute from BGP to something else, BGP will only advertise externally learned routes. To allow the redistribution of iBGP routes into an interior gateway protocol such as EIGRP or OSPF, use the bgp redistribute-internal command in router configuration mode. 


Q93. Refer to the exhibit. 

Which two statements about this route table are true? (Choose two.) 

A. The BGP routes are internal. 

B. The OSPF routes with the E2 flag retain the same metric as they leave the router. 

C. The OSPF routes with the IA flag have their administrative distances incremented as they leave the router. 

D. The BGP routes are external. 

E. The OSPF routes with the E2 flag have their metrics incremented as they leave the router. 

Answer: A,B 

Explanation: 

IBGP routes have an Administrative distance of 200, while EBGP have an AD of 20. Here we see that the BGP routes have an AD value of 200. 

With OSPF, external routes fall under two categories, external type 1 and external type 2. 

The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. The metric for E2 routes do not change when advertising to other routers. 


Q94. What is the function of NSF? 

A. forward traffic simultaneously using both supervisors 

B. forward traffic based on Cisco Express Forwarding 

C. provide automatic failover to back up supervisor in VSS mode 

D. provide nonstop forwarding in the event of failure of one of the member supervisors 

Answer:


Q95. What is the purpose of Route Target Constraint? 

A. to avoid using route reflectors in MPLS VPN networks 

B. to avoid using multiple route distinguishers per VPN in MPLS VPN networks 

C. to be able to implement VPLS with BGP signaling 

D. to avoid sending unnecessary BGP VPNv4 or VPNv6 updates to the PE router 

E. to avoid BGP having to perform route refreshes 

Answer:

Explanation: 

Some service providers have a very large number of routing updates being sent from RRs to PEs, using considerable resources. A PE does not need routing updates for VRFs that are not on the PE; therefore, the PE determines that many routing updates it receives are “unwanted.” The PE can filter out the unwanted updates using Route Target Constraint. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/ios_xe/iproute_bgp/configuration/guide/2_xe/irg_x e_book/irg_rt_filter_xe.html. 


Q96. Which three statements about EIGRP and BFD are true? (Choose three.) 

A. BFD is independent of the routing protocol, so it can be used as a generic failure detection mechanism for EIGRP. 

B. Some parts of BFD can be distributed to the data plane, so it can be less CPU-intensive than reduced timers, which exist wholly at the control plane. 

C. Reduced EIGRP timers have an absolute minimum detection timer of 1-2 seconds; BFD can provide sub-second failure detection. 

D. BFD is tied to specific routing protocols and can be used for generic fault detection for the OSPF, EIGRP, and BGP routing protocols. 

E. BFD is dependent on the EIGRP routing protocol, so it can be used as a specific failure detection mechanism. 

F. BFD resides on the control plane, so it is less CPU-intensive than if it resided on the data plane. 

Answer: A,B,C 

Explanation: 

There are several advantages to implementing BFD over reduced timer mechanisms for routing protocols: 

. Although reducing the EIGRP, IS-IS, and OSPF timers can result in minimum detection timer of one to two seconds, BFD can provide failure detection in less than one second. 

. Because BFD is not tied to any particular routing protocol, it can be used as a generic and consistent failure detection mechanism for EIGRP, IS-IS, and OSPF. 

. Because some parts of BFD can be distributed to the data plane, it can be less CPU-intensive than the reduced EIGRP, IS-IS, and OSPF timers, which exist wholly at the control plane. 

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


Q97. Which implementation can cause packet loss when the network includes asymmetric routing paths? 

A. the use of ECMP routing 

B. the use of penultimate hop popping 

C. the use of Unicast RPF 

D. disabling Cisco Express Forwarding 

Answer:

Explanation: 

When administrators use Unicast RPF in strict mode, the packet must be received on the interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may drop legitimate traffic that is received on an interface that was not the router's choice for sending return traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the network. 

Reference: http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html 


Q98. Which Cisco IOS XE process administers routing and forwarding? 

A. Forwarding manager 

B. Interface manager 

C. Cisco IOS 

D. Host manager 

Answer:

Explanation: 

Some of the processes are listed in the table below: 

Process 

Purpose 

Affected FRUs 

SubPackage Mapping 

Host Manager 

Provides an interface between the IOS process and many of the information-gathering functions of the underlying platform kernel and operating system. 

RP (one instance per RP) 

SIP (one instance per SIP) 

ESP (one instance per ESP) 

RPControl 

SIPBase 

ESPBase 

Interface Manager 

Provides an interface between the IOS process and the per-SPA interface processes on the SIP. 

RP (one instance per RP) 

SIP (one instance per SIP) 

RPControl 

SIPBase 

IOS 

The IOS process implements all forwarding and routing features for the router. 

RP (one per software redundancy instance per RP). Maximum of two instances per RP. 

RPIOS 

Forwarding Manager 

Manages the downloading of configuration to each of the ESPs and the communication of forwarding plane information, such as statistics, to the IOS process. 

RP (one per software redundancy instance per RP). Maximum of two instances per RP. 

ESP (one per ESP) 

RPControl 

ESPBase 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/chassis/asrswcfg /Software_Packaging_Architecture.html 


Q99. Which three fields are part of a TCN BPDU? (Choose three.) 

A. protocol ID 

B. version 

C. type 

D. max-age 

E. flags 

F. message age 

Answer: A,B,C 


Q100. Which mechanism can be used on Layer 2 switches so that only multicast packets with downstream receivers are sent on the multicast router-connected ports? 

A. IGMP snooping 

B. Router Guard 

C. PIM snooping 

D. multicast filtering 

Answer:

Explanation: 

Ideally, the Layer 2 device should forward the multicast transmission only out ports to which receivers are connected and also out any ports that are connected to downstream multicast routers. This configuration requires a Layer 2 device to be able to determine the ports on which multicast routers and receivers for each separate (S,G) or (*,G) multicast group are located. To facilitate intelligent forwarding of multicast traffic on the LAN, Cisco Catalyst switches support two mechanisms: 

. IGMP snooping — The switch listens in or "snoops" IGMP communications between receivers and multicast routers. This snooping enables the switch to determine which ports are connected to receivers for each multicast group and which ports are connected to multicast routers. 

. Cisco Group Management Protocol (CGMP) — The switch communicates with multicasts routers, with multicast routers relaying group membership information to switches. 

Reference: https://www.informit.com/library/content.aspx?b=CCNP_Studies_Switching&seqNum=59