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Q421. DRAG DROP 

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

Answer: 


Q422. Which two fields reside in the initial CHAP challenge packet? (Choose two.) 

A. the authentication name of the challenger 

B. a random hash value generated by the device 

C. the hashed packet type ID 

D. the packet type ID in clear text 

Answer: A,D 

Explanation: 

When a caller A dials in to an access server B, The Access server sends across the link an initial Type 1 authentication packet called a Challenge. This Challenge packet contains a randomly generated number, an ID sequence number to identify the challenge (sent in clear text) and the authentication name of the challenger. 

Reference: http://www.rhyshaden.com/ppp.htm 


Q423. Into which two pieces of information does the LISP protocol split the device identity? (Choose two.) 

A. Routing Locator 

B. Endpoint Identifier 

C. Resource Location 

D. Enterprise Identifier 

E. LISP ID 

F. Device ID 

Answer: A,B 


Q424. Which two statements about OSPFv3 are true? (Choose two.) 

A. It supports unicast address families for IPv4 and IPv6. 

B. It supports unicast address families for IPv6 only. 

C. It supports only one address family per instance. 

D. It supports the use of a cluster ID for loop prevention. 

E. It supports multicast address families for IPv4 and IPv6. 

F. It supports multicast address families for IPv6 only. 

Answer: A,C 


Q425. Which feature of Cisco IOS XE Software allows for platform-independent code abstraction? 

A. its security 

B. Common Management Enabling Technology 

C. the Linux-based environment 

D. its modularity 

Answer: D 


Q426. Which two statements are true about a 6to4 tunnel connecting two IPv6 islands over the IPv4 Internet? (Choose two.) 

A. It embeds the IPv6 packet into the IPv4 payload with the protocol type set to 51. 

B. It works by appending the private IPv4 address (converted into hexadecimal format) to the 2002::/16 prefix. 

C. It embeds the IPv6 packet into the IPv4 payload with the protocol type set to 41. 

D. It works by appending the public IPv4 address (converted into hexadecimal format) to the 2002::/16 prefix. 

Answer: C,D 

Explanation: 

6to4 embeds an IPv6 packet in the payload portion of an IPv4 packet with protocol type 41. To send an IPv6 packet over an IPv4 network to a 6to4 destination address, an IPv4 

header with protocol type 41 is prepended to the IPv6 packet. The IPv4 destination address for the prepended packet header is derived from the IPv6 destination address of the inner packet (which is in the format of a 6to4 address), by extracting the 32 bits immediately following the IPv6 destination address's 2002::/16 prefix. The IPv4 source address in the prepended packet header is the IPv4 address of the host or router which is sending the packet over IPv4. The resulting IPv4 packet is then routed to its IPv4 destination address just like any other IPv4 packet. 

Reference: http://en.wikipedia.org/wiki/6to4 


Q427. Which two DHCP messages are always sent as broadcast? (Choose two.) 

A. DHCPOFFER 

B. DHCPDECLINE 

C. DHCPRELEASE 

D. DHCPREQUEST 

E. DHCPDISCOVER 

Answer: D,E 

Explanation: 

DHCP discovery 

The client broadcasts messages DHCPDISCOVER on the network subnet using the destination address 255.255.255.255 or the specific subnet broadcast address. 

DHCP request 

In response to the DHCP offer, the client replies with a DHCP request, broadcasts to the server, requesting the offered address. A client can receive DHCP offers from multiple servers, but it will accept only one DHCP offer. 

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


Q428. What can PfR passive monitoring mode measure for TCP flows? 

A. only delay 

B. delay and packet loss 

C. delay and reachability 

D. delay, packet loss, and throughput 

E. delay, packet loss, throughput, and reachability 

Answer: E 

Explanation: 

Passive monitoring metrics include the following: 

. Delay: Cisco PfR measures the average delay of TCP flows for a given prefix or traffic class. Delay is the measurement of the round-trip response time (RTT) between the transmission of a TCP synchronization message and receipt of the TCP acknowledgement. 

. Packet loss: Cisco PfR measures packet loss by tracking TCP sequence numbers for each TCP flow; it tracks the highest TCP sequence number. If it receives a subsequent packet with a lower sequence number, PfR increments the packet-loss counter. Packet 

loss is measured in packets per million. 

. Reachability: Cisco PfR measures reachability by tracking TCP synchronization messages that have been sent repeatedly without receiving a TCP acknowledgement. 

. Throughput: Cisco PfR measures TCP throughput by measuring the total number of bytes and packets for each interesting traffic class or prefix for a given interval of time. 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/performance-routing-pfr/product_data_sheet0900aecd806c4ee4.html 


Q429. Refer to the exhibit. 

If the downstream router has a summary route configured, which two actions must you take on the local router to create the summary route that summarizes all routes from the downstream router? (Choose two.) 

A. Configure the summary address on the interface. 

B. Use 10.0.0.0 255.248.0.0 as the summary route. 

C. Configure the summary address in the EIGRP process. 

D. Use 10.0.0.0 255.252.0.0 as the summary route. 

E. Configure a route map to permit the route. 

F. Configure a distribute list in. 

Answer: A,B 

Explanation: 

Route summarization works in conjunction with the ip summary-address eigrp interface configuration command, in which additional summarization can be performed. To correctly summarize all the networks shown, the correct route to use is 10.0.0.0 255.248.0.0 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfeigrp.html 


Q430. Refer to the exhibit. 

Which statement about the debug behavior of the device is true? 

A. The device debugs all IP events for 172.16.129.4. 

B. The device sends all debugging information for 172.16.129.4. 

C. The device sends only NTP debugging information to 172.16.129.4. 

D. The device sends debugging information every five seconds. 

Answer: A 

Explanation: 

This is an example of a conditional debug, where there is a single condition specified of IP address 172.16.129.4. So, all IP events for that address will be output in the debug.