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Q311. DRAG DROP 

Drag each IPv6 extension header on the left to its corresponding description on the right. 

Answer: 


Q312. Refer to the exhibit. 

Which statement is true about a VPNv4 prefix that is present in the routing table of vrf one and is advertised from this router? 

A. The prefix is advertised only with route target 100:1. 

B. The prefix is advertised with route targets 100:1 and 100:2. 

C. The prefix is advertised only with route target 100:3. 

D. The prefix is not advertised. 

E. The prefix is advertised with route targets 100:1, 100:2, and 100:3. 

Answer:

Explanation: 

The route target used for prefix advertisements to other routers is defined on the route-target export command, which shows 100:1 in this case for VPNv4 routes. 


Q313. DRAG DROP 

Drag and drop the BGP attribute on the left to the correct category on the right. 

Answer: 


Q314. Which two features does the show ipv6 snooping features command show information about? (Choose two.) 

A. RA guard 

B. DHCP guard 

C. ND inspection 

D. source guard 

Answer: A,C 

Explanation: 

The show ipv6 snooping features command displays the first-hop features that are configured on the router. Examples 

The following example shows that both IPv6 NDP inspection and IPv6 RA guard are configured on the router: 

Router# show ipv6 snooping features 

Feature name priority state 

RA guard 100 READY 

NDP inspection 20 READY 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/command/ipv6-cr-book/ipv6-s5.html 


Q315. Which two options are requirements for Control-Plane Policing? (Choose two.) 

A. Cisco Express Forwarding must be enabled globally. 

B. Cisco Discovery Protocol must be disabled in the control plane. 

C. A crypto policy must be installed. 

D. A loopback address must be configured for device access. 

E. A class map must be configured to identify traffic. 

Answer: A,E 


Q316. Which option is the default point of insertion for the BGP cost community? 

A. before best path calculation 

B. after best path calculation 

C. after the IGP metric comparison 

D. after the router ID comparison 

Answer:


Q317. Which three statements about RIP timers are true? (Choose three.) 

A. The default update timer is 30 seconds. 

B. The default invalid timer is 180 seconds. 

C. The default holddown timer is 180 seconds. 

D. The default flush timer is 60 seconds. 

E. The default scan timer is 60 seconds. 

F. The default hello timer is 5 seconds. 

Answer: A,B,C 

Explanation: 

The routing information protocol uses the following timers as part of its operation: 

Update Timer 

Invalid Timer 

Flush Timer 

Holddown Timer 

Update Timer 

The update timer controls the interval between two gratuitous Response Message. By default the value is 30 seconds. The response message is broadcast to all its RIP enabled interface. 

Invalid Timer 

The invalid timer specifies how long a routing entry can be in the routing table without being updated. This is also called as expiration Timer. By default, the value is 180 seconds. After the timer expires the hop count of the routing entry will be set to 16, marking the destination as unreachable. 

Flush Timer 

The flush timer controls the time between the route is invalidated or marked as unreachable and removal of entry from the routing table. By default the value is 240 seconds. This is 60 seconds longer than Invalid timer. So for 60 seconds the router will be advertising about this unreachable route to all its neighbors. This timer must be set to a higher value than the invalid timer. 

Hold-down Timer 

The hold-down timer is started per route entry, when the hop count is changing from lower value to higher value. This allows the route to get stabilized. During this time no update can be done to that routing entry. This is not part of the RFC 1058. This is Cisco's implementation. The default value of this timer is 180 seconds. 

Reference: http://en.wikipedia.org/wiki/Routing_Information_Protocol#Timers 


Q318. Which trunking configuration between two Cisco switches can cause a security risk? 

A. configuring different native VLANs on the switches 

B. configuring different trunk modes on the switches 

C. configuring mismatched VLANs on the trunk 

D. disabling DTP on the trunk ports 

E. configuring incorrect channel-groups on the switches 

Answer:


Q319. What is the purpose of EIGRP summary leaking? 

A. to allow a summary to be advertised conditionally on specific criteria 

B. to allow a component of a summary to be advertised in addition to the summary 

C. to allow overlapping summaries to exist on a single interface 

D. to modify the metric of the summary based on which components of the summary are operational 

Answer:

Explanation: 

When you do manual summarization, and still you want to advertise some specific routes to the neighbor, you can do that using leak-map. Please read more about leaking routes here. 

http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1. html#wp1037685. 


Q320. A packet capture log indicates that several router solicitation messages were sent from a local host on the IPv6 segment. What is the expected acknowledgment and its usage? 

A. Router acknowledgment messages will be forwarded upstream, where the DHCP server will allocate addresses to the local host. 

B. Routers on the IPv6 segment will respond with an advertisement that provides an external path from the local subnet, as well as certain data, such as prefix discovery. 

C. Duplicate Address Detection will determine if any other local host is using the same IPv6 address for communication with the IPv6 routers on the segment. 

D. All local host traffic will be redirected to the router with the lowest ICMPv6 signature, which is statically defined by the network administrator. 

Answer: