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Q9. DRAG DROP 

Drag and drop the TACACS+ configuration command on the left to the correct function it performs on the right. 

Answer: 


Q10. Which problem can result when private AS numbers are included in advertisements that are sent to the global Internet BGP table? 

A. The prefixes sent with private AS numbers are always discarded on the Internet. 

B. The prefixes sent with private AS numbers are always tagged as invalid on the Internet. 

C. The prefixes sent with private AS numbers lack uniqueness, which can lead to a loss of connectivity. 

D. The prefixes sent with private AS numbers are sometimes tagged as invalid on the Internet. 

Answer: C 

Explanation: 

Private AS numbers are not meant to be used for global Internet BGP routing, as they are assigned locally and can be used by any organization. They are meant to enable BGP within a enterprise or VPN, but since these numbers can be used by any organization they are not unique and could cause connectivity loss if leaked to the Internet. 


Q11. Which three features require Cisco Express Forwarding? (Choose three.) 

A. NBAR 

B. AutoQoS 

C. fragmentation 

D. MPLS 

E. UplinkFast 

F. BackboneFast 

Answer: A,B,D 

Explanation: 

QoS Features That Require CEF 

These class-based QoS features are supported only on routers that run CEF. 

.Network Based Application Recognition (NBAR) provides intelligent network classification. For more information, refer to Network Based Application Recognition. 

. The AutoQoS -VoIP feature simplifies and speeds up the implementation and provisioning of QoS for VoIP traffic. This feature is enabled with the help of the auto qos voip command. CEF must be enabled at the interface or ATM PVC before the auto qos command can be used. For more information about this feature and its prerequisites, refer to AutoQoS -VoIP. 

From MPLS Fundamentals - Luc De Ghein 

Why Is CEF Needed in MPLS Networks? 

Concerning MPLS, CEF is special for a certain reason; otherwise, this book would not explicitly cover it. Labeled packets that enter the router are switched according to the label forwarding information base (LFIB) on the router. IP packets that enter the router are switched according to the CEF table on the router. Regardless of whether the packet is switched according to the LFIB or the CEF table, the outgoing packet can be a labeled packet or an IP packet 

Reference: http://www.cisco.com/c/en/us/support/docs/asynchronous-transfer-mode-atm/ip-to-atm-class-of-service/4800-cefreq.html 


Q12. Which IPv6 tunneling mechanism requires a service provider to use one of its own native IPv6 blocks to guarantee that its IPv6 hosts will be reachable? 

A. 6rd tunneling 

B. automatic 6to4 tunneling 

C. NAT-PT tunneling 

D. ISATAP tunneling 

E. manual ipv6ip tunneling 

F. automatic 4to6 tunneling 

Answer: A 


Q13. Which two statements about VRRP are true? (Choose two.) 

A. It is assigned multicast address 224.0.0.18. 

B. The TTL for VRRP packets must be 255. 

C. It is assigned multicast address 224.0.0.9. 

D. Its IP protocol number is 115. 

E. Three versions of the VRRP protocol have been defined. 

F. It supports both MD5 and SHA1 authentication. 

Answer: A,B 


Q14. DRAG DROP 

Drag and drop the events on the left to dispaly the correct sequence on the right when CoPP is enabled. 

Answer: 


Q15. Which two statements about PIM-DM are true? (Choose two.) 

A. It forwards multicast packets on a source tree. 

B. It requires an RP. 

C. It forwards multicast packets on a shared distribution tree. 

D. It floods multicast packets to neighbors that have requested the data. 

E. It floods multicast packets throughout the network. 

F. It forwards multicast packets to neighbors that have requested the data. 

Answer: A,E 


Q16. Refer to the exhibit. 

ICMP Echo requests from host A are not reaching the intended destination on host B. What is the problem? 

A. The ICMP payload is malformed. 

B. The ICMP Identifier (BE) is invalid. 

C. The negotiation of the connection failed. 

D. The packet is dropped at the next hop. 

E. The link is congested. 

Answer: D 

Explanation: 

Here we see that the Time to Live (TTL) value of the packet is one, so it will be forwarded to the next hop router, but then dropped because the TTL value will be 0 at the next hop.