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Q471. 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. 


Q472. Which statement describes the function of rekey messages? 

A. They prevent unencrypted traffic from passing through a group member before registration. 

B. They refresh IPsec SAs when the key is about to expire. 

C. They trigger a rekey from the server when configuring the rekey ACL. 

D. They authenticate traffic passing through a particular group member. 

Answer:

Explanation: 

Rekey messages are used to refresh IPsec SAs. When the IPsec SAs or the rekey SAs are about to expire, one single rekey message for a particular group is generated on the key server. No new IKE sessions are created for the rekey message distribution. The rekey messages are distributed by the key server over an existing IKE SA. Rekeying can use multicast or unicast messages. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_getvpn/configuration/xe-3s/sec-get-vpn-xe-3s-book/sec-get-vpn.html 


Q473. Which AS_PATH attribute can you use to prevent loops when implementing BGP confederations? 

A. AS_CONFED_SET 

B. AS_SEQUENCE 

C. AS_CONFED_SEQUENCE 

D. AS_SET 

Answer:


Q474. Refer to the exhibit. 

For which reason could a BGP-speaking device in autonomous system 65534 be prevented from installing the given route in its BGP table? 

A. The AS number of the BGP is specified in the given AS_PATH. 

B. The origin of the given route is unknown. 

C. BGP is designed only for publicly routed addresses. 

D. The AS_PATH for the specified prefix exceeds the maximum number of ASs allowed. 

E. BGP does not allow the AS number 65535. 

Answer:

Explanation: 

BGP is considered to be a 'Path Vector' routing protocol rather than a distance vector routing protocol since it utilises a list of AS numbers to describe the path that a packet should take. This list is called the AS_PATH. Loops are prevented because if a BGP speaking router sees it's own AS in the AS_PATH of a route it rejects the route. 


Q475. Refer to the exhibit. 

Which option is the result of this configuration? 

A. Devices in OSPF area 15 can reach the summary route 192.168.0.0/16 and its more specific subnets. 

B. Devices in OSPF area 15 can reach only the more specific routes of 192.168.0.0/16. 

C. Devices in OSPF area 0 can reach the summary route 192.168.0.0/16 and its more specific subnets. 

D. Devices in OSPF area 0 can reach only the summary route of 192.168.0.0/16. 

Answer:

Explanation: 

. area range 

To consolidate and summarize routes at an area boundary, use the area range command in router configuration mode. To disable this function, use theno form of this command. Area area-id range ip-address mask [advertise | not-advertise] [cost cost] no area area-id range ip-address mask [advertise | not-advertise] [cost cost] 

. Syntax Description 

area-id 

Identifier of the area about which routes are to be summarized. It can be specified as either a decimal value or as an IP address. 

ip-address 

IP address. 

mask 

IP address mask. 

advertise 

(Optional) Sets the address range status to advertise and generates a Type 3 summary link-state advertisement (LSA). 

not-advertise 

(Optional) Sets the address range status to DoNotAdvertise. The Type 3 summary LSA is suppressed, and the component networks remain hidden from other networks. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfospf. html 


Q476. Which EEM event detector is triggered by hardware installation or removal? 

A. Enhanced-Object-Tracking Event Detector 

B. Resource Event Detector 

C. OIR Event Detector 

D. CLI Event Detector 

Answer:


Q477. Refer to the exhibit. 

Which statement is true? 

A. R2 is directly connected to the receiver for this group and is the winner of an assert mechanism. 

B. R2 is directly connected to the receiver for this group, and it forwards the traffic onto Ethernet3/0, but it is forwarding duplicate traffic onto Ethernet3/0. 

C. R2 has the A flag (Accept flag) set on Ethernet 3/0. This is fine, since the group is in BIDIR-PIM mode. 

D. R2 is directly connected to the receiver for this group and is the loser of an assert mechanism. 

E. The A flag is set until the SPT threshold is reached for this multicast group. 

Answer:

Explanation: 

show ip mroute Field Descriptions 

Field 

Description 

RPF neighbor or RPF nbr 

IP address of the upstream router to the source. Tunneling indicates that this router is sending data to the RP encapsulated in register packets. The hexadecimal number in parentheses indicates to which RP it is registering. Each bit indicates a different RP if multiple RPs per group are used. If an asterisk (*) appears after the IP address in this field, the RPF neighbor has been learned through an assert. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ipmulti/command/reference/fiprmc_r/1rfmult 3.html 


Q478. Which two statements are true about IPv6 multicast? (Choose two.) 

A. Receivers interested in IPv6 multicast traffic use IGMPv6 to signal their interest in the IPv6 multicast group. 

B. The PIM router with the lowest IPv6 address becomes the DR for the LAN. 

C. An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8. 

D. The IPv6 all-routers multicast group is FF02:0:0:0:0:0:0:2. 

Answer: C,D 

Explanation: 

Multicast addresses in IPv6 have the prefix ff00::/8. 

Well-known IPv6 multicast addresses 

Address 

Description 

ff02::1 

All nodes on the local network segment 

ff02::2 

All routers on the local network segment 

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


Q479. Refer to the exhibit. 

While reviewing a log file on a router with this NTP configuration, you note that the log entries of the router display a different time than the NTP time. 

Which action can you take to correct the problem? 

A. Add the localtime keyword to the service timestamps log datetime statement. 

B. Add the msec keyword to the service timestamps log datetime statement. 

C. Add the statement ntp broadcast to the NTP configuration of the neighboring router. 

D. Configure the router to be the NTP master. 

E. Remove the datetime keyword from the service timestamps log datetime statement. 

Answer:


Q480. Refer to the exhibit. 

Assume that Cisco Discovery Protocol is supported and enabled only on switches A and C. 

Which information is returned when you issue the command show cdp neighbors on switch C? 

A. a limited amount of information about switch B 

B. neighbor details for switch A 

C. neighbor details for switch B 

D. neighbor details for switch C 

Answer: