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Q101. Which statement is true regarding UDLD and STP timers? 

A. The UDLD message timer should be two times the STP forward delay to prevent loops. 

B. UDLD and STP are unrelated features, and there is no relation between the timers. 

C. The timers need to be synced by using the spanning-tree udld-sync command. 

D. The timers should be set in such a way that UDLD is detected before the STP forward delay expires. 

Answer:

Explanation: 

UDLD is designed to be a helper for STP. Therefore, UDLD should be able to detect an unidirectional link before STP would unblock the port due to missed BPDUs. Thus, when you configure UDLD timers, make sure your values are set so that unidirectional link is detected before “STP MaxAge + 2xForwardDelay” expires. 

Reference: http://blog.ine.com/tag/stp/ 


Q102. Which object tracking function tracks the combined states of multiple objects? 

A. application 

B. interface 

C. stub-object 

D. list 

Answer:


Q103. Refer to the exhibit. 

Which option is the result of this configuration? 

A. All SNMP traffic coming into the router is redirected to interface GigabitEthernet1/0. 

B. All SNMP traffic generated from the router is redirected to interface GigabitEthernet1/0. 

C. All SMTP traffic generated from the router is redirected to interface GigabitEthernet1/0. 

D. All POP3 traffic coming into the router is redirected to interface GigabitEthernet1/0. 

E. All SMTP traffic coming into the router is redirected to interface GigabitEthernet1/0. 

Answer:

Explanation: 

This is an example of policy based routing, where traffic sourced from this router that matches the access list (all traffic with port 25 which is SMTP) will be forced out the Gig 0/1 interface. 


Q104. Which statement about the overload bit in IS-IS is true? 

A. The IS-IS adjacencies on the links for which the overload bit is set are brought down. 

B. Routers running SPF ignore LSPs with the overload bit set and hence avoid blackholing traffic. 

C. A router setting the overload bit becomes unreachable to all other routers in the IS-IS area. 

D. The overload bit in IS-IS is used only for external prefixes. 

Answer:

Explanation: 

The OL bit is used to prevent unintentional blackholing of packets in BGP transit networks. Due to the nature of these protocols, IS-IS and OSPF converge must faster than BGP. Thus there is a possibility that while the IGP has converged, IBGP is still learning the routes. In that case if other IBGP routers start sending traffic towards this IBGP router that has not yet completely converged it will start dropping traffic. This is because it isnt yet aware of the complete BGP routes. OL bit comes handy in such situations. When a new IBGP neighbor is added or a router restarts, the IS-IS OL bit is set. Since directly connected (including loopbacks) addresses on an “overloaded” router are considered by other routers, IBGP can be bought up and can begin exchanging routes. Other routers will not use this router for transit traffic and will route the packets out through an alternate path. Once BGP has converged, the OL bit is cleared and this router can begin forwarding transit traffic. 

Reference: https://routingfreak.wordpress.com/category/ospf-vs-is-is/ 


Q105. Which two options are reasons to manipulate the delay metric instead of the bandwidth metric for EIGRP routing? (Choose two.) 

A. Because the delay metric provides better handling for bursty traffic 

B. Because manipulating the bandwidth metric can also affect QoS 

C. Because manipulating the bandwidth affects only a particular path 

D. Because changes to the delay metric are propagated to all neighbors on a segment 

Answer: B,D 

Explanation: 

Using the bandwidth to influence EIGRP paths is discouraged for two reasons: 

. Changing the bandwidth can have impact beyond affecting the EIGRP metrics. For example, quality of service (QoS) also looks at the bandwidth on an interface. 

. EIGRP throttles to use 50 percent of the configured bandwidth. Lowering the bandwidth can cause problems like staving EIGRP neighbors from getting hello packets because of the throttling back. 

Because changes to the delay metric are propagated to all downstream routers, changing the interface delay parameter is the preferred method of influencing path selection 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13673-14.html 


Q106. 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. 


Q107. Which two values must be identical to allow IS-IS devices to become neighbors? (Choose two.) 

A. interface MTU 

B. authentication key 

C. IP MTU 

D. CLNS address 

E. NSEL 

F. area ID 

Answer: A,B 


Q108. DRAG DROP 

Drag each show command on the left to the description of its output on a PE router on the right. 

Answer: 


Q109. Which two configuration changes should be made on the OTP interface of an EIGRP OTP route reflector? (Choose two.) 

A. passive-interface 

B. no split-horizon 

C. no next-hop-self 

D. hello-interval 60, hold-time 180 

Answer: B,C 

Explanation: 

The EIGRP Over the Top feature enables a single end-to-end Enhanced Interior Gateway Routing Protocol (EIGRP) routing domain that is transparent to the underlying public or private WAN transport that is used for connecting disparate EIGRP customer sites. When an enterprise extends its connectivity across multiple sites through a private or a public WAN connection, the service provider mandates that the enterprise use an additional routing protocol, typically the Border Gateway Protocol (BGP), over the WAN links to ensure end-to-end routing. The use of an additional protocol causes additional complexities for the enterprise, such as additional routing processes and sustained interaction between EIGRP and the routing protocol to ensure connectivity, for the enterprise. With the EIGRP Over the Top feature, routing is consolidated into a single protocol (EIGRP) across the WAN. 

Perform this task to configure a customer edge (CE) device in a network to function as an EIGRP Route Reflector: 

1. enable 

2. configure terminal 

3. router eigrp virtual-name 

4. address-family ipv4 unicast autonomous-system as-number 

5. af-interface interface-type interface-number 

6. no next-hop-self 

7. no split-horizon 

8. exit 

9. remote-neighbors source interface-type interface-number unicast-listen lisp-encap 

10. network ip-address 

11. end 

Note. Use no next-hop-self to instruct EIGRP to use the received next hop and not the local outbound interface address as the next hop to be advertised to neighboring devices. If no next-hop-self is not configured, the data traffic will flow through the EIGRP Route Reflector. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-3s/ire-xe-3s-book/ire-eigrp-over-the-top.html 


Q110. You are configuring a DMVPN hub to perform CBWFQ on a per-spoke basis. Which information is used to identify the spoke? 

A. the NHRP network ID 

B. the spoke tunnel source IP 

C. the spoke tunnel interface IP address 

D. the NHRP group 

Answer: