400-101 Guide

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  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
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2016 Nov 400-101 ccie written exam number:

Q101. Refer to the exhibit. 

What will be the extended community value of this route? 

A. RT:200:3000 RT:200:9999 

B. RT:200:9999 RT:200:3000 

C. RT:200:3000 

D. RT:200:9999 



Here the route map is being used to manually set the extended community RT to 200:9999 

Q102. Which two statements about IS-IS wide metrics are true? (Choose two.) 

A. The wide metric is a 24-bit field. 

B. The maximum link metric is 16777215. 

C. R3 and R4 periodically advertise PNSP messages to synchronize the IS-IS database. 

D. IS-IS devices that are enabled with wide metrics can become neighbors with a device that uses standard metrics. 

E. The maximum link metric is 4261412864. 

F. The maximum path metric is 16777215. 

Answer: A,B 

Q103. What is the purpose of EIGRP summary leaking? 

A. to allow a summary to be advertised conditionally on specific criteria 

B. to allow a component of a summary to be advertised in addition to the summary 

C. to allow overlapping summaries to exist on a single interface 

D. to modify the metric of the summary based on which components of the summary are operational 



When you do manual summarization, and still you want to advertise some specific routes to the neighbor, you can do that using leak-map. Please read more about leaking routes here. 

http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1. html#wp1037685. 

Q104. 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 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. 



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:, 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 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 

Q105. Refer to the exhibit. 

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

A. It allows to be distributed into EIGRP. 

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

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

D. It prevents 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 


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

Renovate 400-101 ccie routing and switching pdf:

Q106. Which statement about WAN Ethernet Services is true? 

A. Rate-limiting can be configured per EVC. 

B. Point-to-point processing and encapsulation are performed on the customer network. 

C. Ethernet multipoint services function as a multipoint-to-multipoint VLAN-based connection. 

D. UNIs can perform service multiplexing and all-in-one bundling. 



The MEF has defined a set of bandwidth profiles that can be applied at the UNI or to an EVC. A bandwidth profile is a limit on the rate at which Ethernet frames can traverse the UNI or the EVC. 

Reference: http://www.ciscopress.com/articles/article.asp?p=101367&seqNum=2 

Q107. Which three statements about IPsec VTIs are true? (Choose three.) 

A. IPsec sessions require static mapping to a physical interface. 

B. They can send and receive multicast traffic. 

C. They can send and receive traffic over multiple paths. 

D. They support IP routing and ACLs. 

E. They can send and receive unicast traffic. 

F. They support stateful failover. 

Answer: B,D,E 

Q108. In an STP domain, which two statements are true for a nonroot switch, when it receives a configuration BPDU from the root bridge with the TC bit set? (Choose two.) 

A. It sets the MAC table aging time to max_age time. 

B. It sets the MAC table aging time to forward_delay time. 

C. It recalculates the STP topology upon receiving topology change notification from the root switch. 

D. It does not recalculate the STP topology upon receiving topology change notification from the root switch. 

Answer: B,D 

Q109. Which three statements about implementing an application layer gateway in a network are true? (Choose three.) 

A. It allows client applications to use dynamic ports to communicate with a server regardless of whether NAT is being used. 

B. It maintains granular security over application-specific data. 

C. It allows synchronization between multiple streams of data between two hosts. 

D. Application layer gateway is used only in VoIP/SIP deployments. 

E. Client applications require additional configuration to use an application layer gateway. 

F. An application layer gateway inspects only the first 64 bytes of a packet before forwarding it through the network. 

Answer: A,B,C 


An ALG may offer the following functions: 

. allowing client applications to use dynamic ephemeral TCP/ UDP ports to communicate with the known ports used by the server applications, even though a firewall configuration may allow only a limited number of known ports. In the absence of an ALG, either the ports would get blocked or the network administrator would need to explicitly open up a large number of ports in the firewall — rendering the network vulnerable to attacks on those ports. 

. converting the network layer address information found inside an application payload between the addresses acceptable by the hosts on either side of the firewall/NAT. This aspect introduces the term 'gateway' for an ALG. 

. recognizing application-specific commands and offering granular security controls over them 

. synchronizing between multiple streams/sessions of data between two hosts exchanging data. For example, an FTP application may use separate connections for passing control commands and for exchanging data between the client and a remote server. During large file transfers, the control connection may remain idle. An ALG can prevent the control connection getting timed out by network devices before the lengthy file transfer completes. 

Reference: http://en.wikipedia.org/wiki/Application-level_gateway 

Q110. Refer to the exhibit. 

If a console port is configured as shown, which response is displayed when you connect to the console port? 

A. a blinking cursor 

B. the message "Authorized users only" 

C. the username prompt 

D. three username name prompts followed by a timeout message 

E. the message "Connection refused" 


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