400-101 Guide

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  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
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2017 Apr 400-101 exam guide

Q341. When you implement CoPP on your network, what is its default action? 

A. permit all traffic 

B. rate-limit bidirectional traffic to the control plane 

C. drop management ingress traffic to the control plane 

D. monitor ingress and egress traffic to the control plane by using access groups that are applied to the interface 

E. block all traffic 

Answer:


Q342. Refer to the exhibit. 

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

A. It allows 172.16.0.0/16 to be distributed into EIGRP. 

B. It allows a default route to be distributed into EIGRP. 

C. It allows 172.16.0.0/16 and larger subnets to be distributed into EIGRP. 

D. It prevents 172.16.0.0/16 from being distributed into EIGRP. 

E. It prevents a default route from being distributed into EIGRP. 

F. It creates summary routes and injects them into EIGRP. 

Answer: A,B 

Explanation: 

In this example, the prefix list is configured to only allow the two specific routes of 172.16.0.0/16 and the default route. Any other routes will be filtered. 


Q343. For which feature is the address family "rtfilter" used? 

A. Enhanced Route Refresh 

B. MPLS VPN filtering 

C. Route Target Constraint 

D. Unified MPLS 

Answer:

Explanation: 

With Multiprotocol Label Switching (MPLS) VPN, the internal Border Gateway Protocol (iBGP) peer or Route Reflector (RR) sends all VPN4 and/or VPN6 prefixes to the PE routers. The PE router drops the VPN4/6 prefixes for which there is no importing VPN routing and forwarding (VRF). This is a behavior where the RR sends VPN4/6 prefixes to the PE router, which it does not need. This is a waste of processing power on the RR and the PE and a waste of bandwidth. With Route Target Constraint (RTC), the RR sends only wanted VPN4/6 prefixes to the PE. 'Wanted' means that the PE has VRF importing the specific prefixes. RFC 4684 specifies Route Target Constraint (RTC). The support is through a new address family rtfilter for both VPNv4 and VPNv6. 

Reference: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116062-technologies-technote-restraint-00.html 


Q344. DRAG DROP 

Drag and drop each IPv6 neighbor discovery message type on the left to the corresponding description on the right. 

Answer: 


Q345. Which statement describes Cisco PfR link groups? 

A. Link groups enable Cisco PfR Fast Reroute when NetFlow is enabled on the external interfaces of the border routers. 

B. Link groups define a strict or loose hop-by-hop path pReference: 

C. Link groups are required only when Cisco PfR is configured to load-balance all traffic. 

D. Link groups are enabled automatically when Cisco PfR is in Fast Reroute mode. 

E. Link groups set a preference for primary and fallback (backup) external exit interfaces. 

Answer:

Explanation: 

The Performance Routing - Link Groups feature introduced the ability to define a group of exit links as a preferred set of links, or a fallback set of links for PfR to use when optimizing traffic classes specified in an PfR policy. PfR currently selects the best link for a traffic class based on the preferences specified in a policy and the traffic class performance—using parameters such as reachability, delay, loss, jitter or MOS—on a path out of the specified link. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-link-group.html 


Improved 400-101 practice exam:

Q346. Refer to the exhibit. 

Which statement is true? 

A. R1 routes this pseudowire over MPLS TE tunnel 1 with transport label 20. 

B. The default route 0.0.0.0/0 is available in the IPv4 routing table. 

C. R1 is using an MPLS TE tunnel for this pseudowire, because the IP path is not available. 

D. R1 has preferred-path configured for the pseudowire. 

Answer:

Explanation: 

Verifying the Configuration: Example In the following example, the show mpls l2transport vc command shows the following information (in bold) about the VCs: 

. VC 101 has been assigned a preferred path called Tunnel1. The default path is disabled because the preferred path specified that the default path should not be used if the preferred path fails. 

. VC 150 has been assigned an IP address of a loopback address on PE2. The default path can be used if the preferred path fails. 

Router# show mpls l2transport vc detail 

Local interface. Gi0/0/0.1 up, line protocol up, Eth VLAN 222 up 

Destination address: 10.16.16.16, VC ID. 101, VC status: up 

Preferred path: Tunnel1, active 

Default path: disabled

Tunnel label: 3, next hop point2point 

Output interfacE. Tu1, imposed label stack {17 16} 

Create timE. 00:27:31, last status change timE. 00:27:31 

Signaling protocol: LDP, peer 10.16.16.16:0 up 

MPLS VC labels: local 25, remote 16 

Group ID. local 0, remote 6 

MTU: local 1500, remote 1500 

Remote interface description: 

Sequencing: receive disabled, send disabled 

VC statistics: 

packet totals: receive 10, send 10 

byte totals: receive 1260, send 1300 

packet drops: receive 0, send 0 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srtunsel.html#wp10 57815 


Q347. 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 


Q348. DRAG DROP 

Drag and drop the BGP state on the left to the action that defines it on the right. 

Answer: 


Q349. DRAG DROP 

Drag and drop the IPv6 address on the left to the correct IPv6 address type on the right. 

Answer: 


Q350. DRAG DROP 

Drag and drop the RIP configuration command on the left to the function it performs on the right. 

Answer: 


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