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Q151. Refer to the exhibit. 

Which action must you take to enable full reachability from router C to router D? 

A. Build an OSPF virtual link. 

B. Build an OSPF sham link. 

C. Configure mutual redistribution between OSPF and EIGRP on routers A and B. 

D. Add a static route on router D. 

Answer:

Explanation: 

For full connectivity, we need to configure mutual redistribution to advertise the EIGRP routes into OSPF and to advertise the OSPF routes into the EIGRP network. This needs to be done at the two border routers that connect to both the EIGRP and OSPF domains. 

Q152. Which two statements describe characteristics of HDLC on Cisco routers? (Choose two.) 

A. It supports multiple Layer 3 protocols. 

B. It supports multiplexing. 

C. It supports only synchronous interfaces. 

D. It supports authentication. 

Answer: A,C 

Explanation: 

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. Cisco HDLC is the default for data encapsulation at Layer 2 (data link) of the Open System Interconnection (OSI) stack for efficient packet delineation and error control. The absence of a protocol type field in the HDLC header posed a problem for links that carried traffic from more than one Layer 3 protocol. Cisco, therefore, added an extra Type field to the HDLC header, creating a Cisco-specific version of HDLC. Cisco routers can support multiple network layer protocols on the same HDLC link. For example an HDLC link between two Cisco routers can forward both IPv4 and IPv6 packets because the Type field can identify which type of packet is carried inside each HDLC frame. 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/ 

819_SCG/6ser_conf.html#pgfId-1073734 

Q153. Which IP SLA operation type uses IP to measure the round-trip time between a router and a device? 

A. HTTP 

B. ICMP Echo 

C. ICMP Path Jitter 

D. UDP Jitter for VoIP 

Answer:

Q154. Refer to the exhibit. 

What is the role of this multicast router? 

A. a first-hop PIM router 

B. a last-hop PIM router 

C. a PIM rendezvous point 

D. a PIM inter-AS router 

Answer:

Explanation: 

The following is sample output from the show ip pim tunnel taken from an RP. The output is used to verify the PIM Encap and Decap Tunnel on the RP: 

Switch# show ip pim tunnel 

Tunnel0 

Type : PIM Encap 

RP : 70.70.70.1* 

SourcE. 70.70.70.1 

Tunnel1* 

Type : PIM Decap 

RP : 70.70.70.1* 

SourcE. -R2# 

The asterisk (*) indicates that the router is the RP. The RP will always have a PIM Encap and Decap Tunnel interface. 

Reference: 

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3650/software/release/3se/multic ast/command_reference/b_mc_3se_3650_cr/b_mc_3se_3650_cr_chapter_010.html#wp12 86920037 

Q155. What is the ip dhcp snooping information option command used for? 

A. It displays information about the DHCP snooping table. 

B. It sends a syslog and an SNMP trap for a DHCP snooping violation. 

C. It enables the DHCP snooping host tracking feature. 

D. It enables DHCP option 82 data insertion. 

Answer:

Explanation: 

To enable DHCP option-82 data insertion, perform this task: 

Command 

Purpose 

Step 1 

Router(config)# ip dhcp snooping information option 

Enables DHCP option-82 data insertion. 

Step 2 

Router(config)# ip dhcp snooping information option replace 

Or: 

Router(config-if)# ip dhcp snooping information option replace 

(Optional) Replaces the DHCP relay information option received in snooped packets with the switch's option-82 data. 

Step 3 

Router(config)# do show ip dhcp snooping | include 82 

Verifies 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snoodhcp.html 

Q156. Which statement about OSPF loop prevention is true? 

A. The discard route is generated automatically on the ABR to prevent routing loops. 

B. The ASBR uses type 3 LSAs from non-backbone areas to prevent control-plane routing loops. 

C. The ABR can filter type 3 LSPs to prevent routing loops. 

D. The DN bit ignores LSA types 2, 3, and 5 to prevent routing loops. 

Answer:

Q157. Which action does route poisoning take that serves as a loop-prevention method? 

A. It immediately sends routing updates with an unreachable metric to all devices. 

B. It immediately sends routing updates with a metric of 255 to all devices. 

C. It prohibits a router from advertising back onto the interface from which it was learned. 

D. It advertises a route with an unreachable metric back onto the interface from which it was learned. 

E. It poisons the route by tagging it uniquely within the network. 

Answer:

Explanation: 

With route poisoning, when a router detects that one of its connected routes has failed, the router will poison the route by assigning an infinite metric to it and advertising it to neighbors. 

Q158. Which three statements about the default behaviour of eBGP sessions are true? (Choose three.) 

A. eBGP sessions between sub-ASs in different confederations transmit the next hop unchanged. 

B. The next hop in an eBGP peering is the IP address of the neighbor that announced the route. 

C. When a route reflector reflects a route to a client, it transmits the next hop unchanged. 

D. The next hop in an eBGP peering is the loopback address of the interface that originated the route. 

E. The next hop in an eBGP peering is the loopback address of the neighbor that announced the route. 

F. When a route reflector reflects a route to a client, it changes the next hop to its own address. 

Answer: A,B,C 

Q159. What are the minimal configuration steps that are required to configure EIGRP HMAC-SHA2 authentication? 

A. classic router mode, interface XX, authentication mode hmac-sha-256 <password> 

B. named router mode, address-family statement, authentication mode hmac-sha-256 <password> 

C. named router mode, address-family statement, af-interface default, authentication mode hmac-sha-256 <password> 

D. named router mode, address-family statement, authentication mode hmac-sha-256 <password> 

Answer:

Explanation: 

The example below shows how to configure EIGRP HMAC-SHA2 on Cisco router: 

Device(config)# router eigrp name1 

Device(config-router)# address-family ipv4 autonomous-system 45000 

Device(config-router-af)# af-interface ethernet 0/0 

Device(config-router-af-interface)# authentication mode hmac-sha-256 0 password1 

Device(config-router-af-interface)# end 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-sy/ire-15-sy-book/ire-sha-256.html 

Q160. Which statement about the RPF interface in a BIDIR-PIM network is true? 

A. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the PIM rendezvous point. 

B. In a BIDIR-PIM network, the RPF interface can be the interface that is used to reach the PIM rendezvous point or the interface that is used to reach the source. 

C. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the source. 

D. There is no RPF interface concept in BIDIR-PIM networks. 

Answer:

Explanation: 

RPF stands for "Reverse Path Forwarding". The RPF Interface of a router with respect to an address is the interface that the MRIB indicates should be used to reach that address. In the case of a BIDIR-PIM multicast group, the RPF interface is determined by looking up the Rendezvous Point Address in the MRIB. The RPF information determines the interface of the router that would be used to send packets towards the Rendezvous Point Link for the group. 

Reference: https://tools.ietf.org/html/rfc5015