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Q481. Which two BGP attributes are optional, non-transitive attributes? (Choose two.) 

A. AS path 

B. local preference 

C. MED 

D. weight 

E. cluster list 

Answer: C,E 


Q482. Which option describes the effect of the OSPF default-information originate always command? 

A. It creates a stub area. 

B. It configures the device to advertise a default route regardless of whether it exists in the routing table. 

C. It configures the device to automatically redistribute a default route. 

D. It adds a static default route to the device configuration. 

Answer:

Explanation: 

default-information originate 

To generate a default external route into an Open Shortest Path First (OSPF) routing domain, use the default-information originate command in router configuration mode. To disable this feature, use the no form of this command. 

default-information originate [always] metric metric-value [ metric-type type-value ] [ route-map map-name ] 

Syntax Description 

always (Optional) Always advertises the default route regardless of whether the software has a default route. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/command/ipv6-cr-book/ipv6-d2.html 


Q483. 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 


Q484. Refer to the exhibit. 

Router R2 is learning the 192.168.1.0/24 network from R1 via EIGRP and eBGP. R2 then redistributes EIGRP into OSPF as metric-type 2 with default metrics. Which metric of the route in the R3 routing table? 

A. 20 

B. 30 

C. 110 

D. The route is not present in the R3 routing table. 

Answer:


Q485. Which technology is not necessary to set up a basic MPLS domain? 

A. IP addressing 

B. an IGP 

C. LDP or TDP 

D. CEF 

E. a VRF 

Answer:

Explanation: 

The simplest form of VRF implementation is VRF Lite. In this implementation, each router within the network participates in the virtual routing environment in a peer-based fashion. While simple to deploy and appropriate for small to medium enterprises and shared data centres, VRF Lite does not scale to the size required by global enterprises or large carriers, as there is the need to implement each VRF instance on every router, including intermediate routers. VRFs were initially introduced in combination with MPLS, but VRF proved to be so useful that it eventually evolved to live independent of MPLS. This is the historical explanation of the term VRF Lite. Usage of VRFs without MPLS. 

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


Q486. Refer to the exhibit. 

Router A and router B are physically connected over an Ethernet interface, and IS-IS is configured as shown. Which option explains why the IS-IS neighborship is not getting formed between router A and router B? 

A. same area ID 

B. same N selector 

C. same domain ID 

D. same system ID 

Answer:

Explanation: 

With IS-IS, the LSP identifier is derived from the system ID (along with the pseudonode ID and LSP number). Each IS is usually configured with one NET and in one area; each system ID within an area must be unique. The big difference between NSAP style addressing and IP style addressing is that, in general, there will be a single NSAP address for the entire router, whereas with IP there will be one IP address per interface. All ISs and ESs in a routing domain must have system IDs of the same length. All routers in an area must have the same area address. All Level 2 routers must have a unique system ID domain-wide, and all Level 1 routers must have a unique system ID area-wide. 

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.sh tml 


Q487. 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:


Q488. Refer to the exhibit. 

What is the polling frequency set by this configuration? 

A. 60 seconds 

B. 10 seconds 

C. 360 seconds 

D. 60 milliseconds 

E. 10 milliseconds 

Answer:

Explanation: 

The frequency value lists the polling interval, in seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_icmp_echo.html 


Q489. Which two events occur when a packet is decapsulated in a GRE tunnel? (Choose two.) 

A. The destination IPv4 address in the IPv4 payload is used to forward the packet. 

B. The TTL of the payload packet is decremented. 

C. The source IPv4 address in the IPv4 payload is used to forward the packet. 

D. The TTL of the payload packet is incremented. 

E. The version field in the GRE header is incremented. 

F. The GRE keepalive mechanism is reset. 

Answer: A,B 

Explanation: 

After the GRE encapsulated packet reaches the remote tunnel endpoint router, the GRE packet is decapsulated. The destination address lookup of the outer IP header (this is the same as the tunnel destination address) will find a local address (receive) entry on the ingress line card. The first step in GRE decapsulation is to qualify the tunnel endpoint, before admitting the GRE packet into the router, based on the combination of tunnel source (the same as source IP address of outer IP header) and tunnel destination (the same as destination IP address of outer IP header). If the received packet fails tunnel admittance qualification check, the packet is dropped by the decapsulation router. On successful tunnel admittance check, the decapsulation strips the outer IP and GRE header off the packet, then starts processing the inner payload packet as a regular packet. When a tunnel endpoint decapsulates a GRE packet, which has an IPv4/IPv6 packet as the payload, the destination address in the IPv4/IPv6 payload packet header is used to forward the packet, and the TTL of the payload packet is decremented. 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/addr-serv/configuration/guide/b-ipaddr-cg53asr9k/b-ipaddr-cg53asr9k_chapter_01001.html 


Q490. DRAG DROP 

Drag each GETVPN component on the left to its function on the right. 

Answer: