400-101 Guide

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  • Cisco
  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
  • 911 Q&As
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  • Jun 18,2018
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Q491. Which three statements are true about PPP CHAP authentication? (Choose three.) 

A. PPP encapsulation must be enabled globally. 

B. The LCP phase must be complete and in closed state. 

C. The hostname used by a router for CHAP authentication cannot be changed. 

D. PPP encapsulation must be enabled on the interface. 

E. The LCP phase must be complete and in open state. 

F. By default, the router uses its hostname to identify itself to the peer. 

Answer: D,E,F 

Explanation: 

Point-to-Point Protocol (PPP) authentication issues are one of the most common causes for dialup link failures. This document provides some troubleshooting procedures for PPP authentication issues. 

Prerequisites 

. Enable PPP encapsulation 

. The PPP authentication phase does not begin until the Link Control Protocol (LCP) phase is complete and is in the open state. If debug ppp negotiation does not indicate that LCP is open, troubleshoot this issue before proceeding. 

Note. By default, the router uses its hostname to identify itself to the peer. However, this CHAP username can be changed through the ppp chap hostname command. 

Reference: http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25647-understanding-ppp-chap.html 


Q492. Refer to the exhibit. The Main1 and Branch1 switches are connected directly over an MPLS pseudowire, and both run UDLD. After router B1 reloads because of a power failure, the pseudowire is restored. However, the Branch1 switch is unable to reach the Main1 switch. 

Which two actions can you take to restore connectivity and prevent the problem from recurring? (Choose two.) 

A. Configure a backup pseudowire between the Main1 and Branch1 switches. 

B. Enable UDLD recovery on both the Main1 and Branch1 switches. 

C. Configure a backup GRE tunnel between the Main1 and Branch1 switches. 

D. Enable errdisable recovery on both the Main1 and Branch1 switches. 

E. Issue the shutdown and no shutdown commands on both the Branch1 switch’s uplink to the B1 router and the Main1 switch’s uplink to the M1 router. 

F. Issue the shutdown and no shutdown commands on the Branch1 switch uplink to the B1 router only. 

Answer: D,F 


Q493. Which statement about VRRP is true? 

A. It supports load balancing. 

B. It can be configured with HSRP on a switch or switch stack. 

C. It supports IPv4 and IPv6. 

D. It supports encrypted authentication. 

Answer:

Explanation: 

VRRP Limitations 

. You can configure both HSRP and VRRP on a switch or switch stack. However, you cannot add a switch model that supports only one protocol to a stack that is configured for both protocols. 

. The VRRP implementation on the switch does not support the MIB specified in RFC 2787. 

. The VRRP implementation on the switch supports only text -based authentication. 

. The switch supports VRRP only for IPv4. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/1 2-2_58_se/configuration/guide/3750xscg/swhsrp.html#pgfId-1107127 


Q494. DRAG DROP 

Drag and drop the multiprotocol BGP feature on the left to the corresponding description on the right. 

Answer: 


Q495. Which two pieces of information does RTCP use to inform endpoint devices about the RTP flow? (Choose two.) 

A. the transmitted octet 

B. the lost packet count 

C. session control function provisioning information 

D. the CNAME for session participants 

E. the authentication method 

F. MTU size changes in the path of the flow 

Answer: A,B 

Explanation: 

RTCP transports statistics for a media connection and information such as transmitted octet and packet counts, packet loss, packet delay variation, and round-trip delay time. An application may use this information to control quality of service parameters, perhaps by limiting flow, or using a different codec. 

Reference: http://en.wikipedia.org/wiki/RTP_Control_Protocol 


Q496. Which protocol will accept incoming updates when the passive-interface command is configured? 

A. OSPF 

B. IS-IS 

C. RIP 

D. EIGRP 

Answer:


Q497. Which three message types are used for prefix delegation in DHCPv6? (Choose three.) 

A. DHCP Discover 

B. Renew 

C. Solicit 

D. DHCP Offer 

E. Advertise 

F. DHCP Ack 

Answer: B,C,E 

Explanation: 

DHCPv6 Message Types 

For a client to get an IPv6 address successfully from a DHCPv6 server, the Client-Server Conversation happens using the following messages. 

Client--->Server Messages 

Server--->Client Messages 

Solicit, Request, Confirm, Renew, Rebind, Release, Decline, Information-Request Advertise, Reply, Reconfigure 

Lets look at each message types in detail: 

SOLICIT 

This is the first step in DHCPv6, where a DHCPv6 client sends a Solicit message to locate DHCPv6 servers. 

ADVERTISE 

Upon receiving a Solicit Message from the client, the DHCPv6 server sends an Advertise message to indicate that it is available for DHCP service, in response to a Solicit message received from a client. 

REQUEST 

This message is sent by the DHCPv6 client.Client sends a Request message to request configuration parameters which includes IP addresses or delegated prefixes, from a specific server. 

CONFIRM 

Confirm message is sent by the client to any available server in the network to confirm that the client is still on the same link or it has to be removed. This message also confirms the IPv6 addresses that are assigned to the link are still valid. This could happen in case when a client detects a change in link-layer connectivity or if the device is powered on and it is found that one or more leases are still valid. Note that only the prefix portion of the addresses are validated and not the actual leases. 

RENEW 

A client sends a Renew message to the server when it wants to extend the lifetimes on the addresses and other configuration parameters assigned to the client and also to update other configuration parameters. 

REBIND 

In case of No response from the DHCPv6 Server for the Renew message, the client sends a Rebind message to any available server to extend the lifetimes on the address and to update other configuration parameters. 

REPLY 

A Reply message is sent by the DHCPv6 Server in response to a Solicit, Request, Renew, Rebind message received from a client. The reply message is sent by the server in response to a confirm message (either confirming or denying) that the addresses assigned to the client are appropriate.In short the server acknowledge receipt of a Release or Decline message by sending a REPLY message. 

RELEASE 

Release message as the name implies, is sent by the client to the server that has assigned the addresses, to indicate that the client will no longer use the assigned addresses (one or more). 

DECLINE 

Client sends a Decline message to the DHCPv6 server to tell that the one or more addresses assigned by the server is already in use 

RECONFIGURE 

The Reconfigure Message is sent by the DHCPv6 server to the client when the server has new or updated information of configuration parameters. It tells the client to initiate a information-request/reply message to the server so as to receive the updated information. 

INFORMATION-REQUEST 

Information-Request message is sent by the client to the server to update the configuration parameters 

Reference: https://supportforums.cisco.com/blog/153426/implementing-dhcpv6-introduction 


Q498. A floating static route appears in the routing table of an interface even when the interface is unusable. 

Which action can you take to correct the problem? 

A. Remove the permanent option from the static route. 

B. Correct the administrative distance. 

C. Configure the floating static route to point to another route in the routing table. 

D. Correct the DHCP-provided route on the DHCP server. 

Answer:


Q499. In which two modes do IPv6-in-IPv4 tunnels operate? (Choose two.) 

A. tunnel mode 

B. transport mode 

C. 6to4 mode 

D. 4to6 mode 

E. ISATAP mode 

Answer: C,E 

Explanation: 

*There are 5 tunneling solution in IPv6:* 

*1. Using the “Tunnel mode ipv6ip”, in this case the tunnel source and destination are configured with IPv4 addressing and the tunnel interface is configured with IPv6. This will use protocol 41. This is used for IPv6/IPv4. 

R1(config)#int tunnel 1 

R1(config-if)#ipv6 address 12:1:12::1/64 

R1(config-if)#tunnel source 10.1.12.1 

R1(config-if)#tunnel destination 10.1.12.2 

R1(config-if)#*tunnel mode ipv6ip* 

*

2. Using the “Tunnel mode gre ipv6, in this case the tunnel source and destination are all configured with IPv6 addressing. This is used for IPv6/IPv6. 

BB1(config)#int tunnel 1 

BB1(config-if)#ipv6 address 121:1:121::111/64 

BB1(config-if)#tunnel source 10:1:111::111 

BB1(config-if)#tunnel destination 10:1:112::112 

BB1(config-if)#*tunnel mode gre ipv6* 

*3. 

In this case, the third type, the tunnel mode is NOT used at all, note that the tunnel interface is configured with IPv6 and the tunnel source and destination is configured with IPv4 but no mention of tunnel mode. This configuration will use protocol 47. This is used for IPv6/IPv4. 

R1(config)#int tunnel 13 

R1(config-if)#ipv6 address 13:1:13::1/64 

R1(config-if)#tunnel source 10.1.13.1 

R1(config-if)#tunnel destination 10.1.13.3 

*4. Note in this case a special addressing is assigned to the tunnel interface which is a concatenation of a reserved IPv6 address of 2002followed by the translated IPv4 address of a given interface on the router. In this configuration ONLY the tunnel source address is used and since the tunnel is automatic, the destination address is NOT configured. The tunnel mode is set to “Tunnel mode ipv6ip 6to4. Note the IPv4 address of 10.1.1.1 is translated to 0A.01.01.01 and once concatenated, it will be “2002:0A01:0101: or 2002:A01:101. This is used for IPv6/IPv4. 

R1(config)#interface Tunnel14 

R1(config-if)#ipv6 address 2002:A01:101::/128 

R1(config-if)#tunnel source 10.1.1.1 

R1(config-if)#*tunnel mode ipv6ip 6to4* 

*5. ISATAP, ISATAP works like 6to4 tunnels, with one major difference, it uses a special IPv6 address which is formed as follows: * 

*In this tunnel mode, the network portion can be any IPv6 address, whereas in 6to4 it had to start with 2002.* 

*Note when the IPv6 address is assigned to the tunnel interface, the “eui-64 is used, in this case the host portion of the IPv6 address starts with “0000.5EFE” and then the rest of the host portion is the translated IPv4 address of the tunnel’s source IPv4 address. This translation is performed automatically unlike 6to4. This is used for IPv6/IPv4.* 

R4(config)#int tunnel 46 

R4(config-if)#ipv6 address 46:1:46::/64 eui-64 

R4(config-if)#tunnel source 10.44.44.44 

R4(config-if)#*tunnel mode ipv6ip ISATAP* 


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