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Q201. Which statement about traffic management when PIM snooping is enabled is true? 

A. Traffic is restricted to host ports. 

B. All multicast traffic is flooded to the designated router. 

C. Join message are flooded to all routers. 

D. Designated routers receive traffic only from groups through which a join message is received. 

Answer:


Q202. Refer to the exhibit. 

Which two statements about the implementation are true? (Choose two.) 

A. The PPP multilink protocol header is omitted on delay-sensitive packets. 

B. The maximum number of fragments is 1. 

C. Small real-time packets are multilink-encapsulated. 

D. A transmit queue is provided for smaller packets. 

Answer: A,D 

Explanation: 

Previous implementations of Cisco IOS Multilink PPP (MLP) include support for Link Fragmentation Interleaving (LFI). This feature allows the delivery of delay-sensitive packets, such as the packets of a Voice call, to be expedited by omitting the PPP Multilink Protocol header and sending the packets as raw PPP packets in between the fragments of larger data packets. This feature works well on bundles consisting of a single link. However, when the bundle contains multiple links there is no way to keep the interleaved packets in sequence with respect to each other. The Multiclass Multilink PPP (MCMP) feature in Cisco IOS Release 12.2(13)T addresses the limitations of MLP LFI on bundles containing multiple links by introducing multiple data classes. With multiclass multilink PPP interleaving, large packets can be multilink-encapsulated and fragmented into smaller packets to satisfy the delay requirements of real-time voice traffic; small real-time packets, which are not multilink encapsulated, are transmitted between fragments of the large packets. The interleaving feature also provides a special transmit queue for the smaller, delay-sensitive packets, enabling them to be transmitted earlier than other flows. Interleaving provides the delay bounds for delay-sensitive voice packets on a slow link that is used for other best-effort traffic. 

References: http://www.cisco.com/c/en/us/td/docs/ios/dial/configuration/guide/12_4t/dia_12_4t_book/dia _multiclass_link_ppp.pdf http://www.cisco.com/c/en/us/td/docs/routers/access/500/520/software/configuration/guide/520_SCG_Book/520scg_concepts.html 


Q203. Which three statements are functions that are performed by IKE phase 1? (Choose three.) 

A. It builds a secure tunnel to negotiate IKE phase 1 parameters. 

B. It establishes IPsec security associations. 

C. It authenticates the identities of the IPsec peers. 

D. It protects the IKE exchange by negotiating a matching IKE SA policy. 

E. It protects the identities of IPsec peers. 

F. It negotiates IPsec SA parameters. 

Answer: C,D,E 

Explanation: 

The basic purpose of IKE phase 1 is to authenticate the IPSec peers and to set up a secure channel between the peers to enable IKE exchanges. IKE phase 1 performs the following functions: 

. Authenticates and protects the identities of the IPSec peers 

. Negotiates a matching IKE SA policy between peers to protect the IKE exchange 

. Performs an authenticated Diffie-Hellman exchange with the end result of having matching shared secret keys 

. Sets up a secure tunnel to negotiate IKE phase 2 parameters 

Reference: http://www.ciscopress.com/articles/article.asp?p=25474&seqNum=7


Q204. DRAG DROP 

Drag and drop each DHCP term on the left to the corresponding definition on the right. 

Answer: 


Q205. Which map is locally defined? 

A. DSCP-to-DSCP-mutation 

B. CoS-to-DSCP 

C. IP-precedence-to-DSCP 

D. DSCP-to-CoS 

Answer:


Q206. What is the cause of ignores and overruns on an interface, when the overall traffic rate of the interface is low? 

A. a hardware failure of the interface 

B. a software bug 

C. a bad cable 

D. microbursts of traffic 

Answer:

Explanation: 

Micro-bursting is a phenomenon where rapid bursts of data packets are sent in quick succession, leading to periods of full line-rate transmission that can overflow packet buffers of the network stack, both in network endpoints and routers and switches inside the network. Symptoms of micro bursts will manifest in the form of ignores and/ or overruns (also shown as accumulated in “input error” counter within show interface output). This is indicative of receive ring and corresponding packet buffer being overwhelmed due to data bursts coming in over extremely short period of time (microseconds). You will never see a sustained data traffic within show interface’s “input rate” counter as they are averaging bits per second (bps) over 5 minutes by default (way too long to account for microbursts). You can understand microbursts from a scenario where a 3-lane highway merging into a single lane at rush hour – the capacity burst cannot exceed the total available bandwidth (i.e. single lane), but it can saturate it for a period of time. 

Reference: http://ccieordie.com/?tag=micro-burst 


Q207. Which two operating modes does VPLS support? (Choose two.) 

A. transport mode 

B. strict mode 

C. port mode 

D. loose mode 

E. VLAN mode 

F. dynamic mode 

Answer: C,E 


Q208. Refer to the exhibit. 

IPv6 SLAAC clients that are connected to the router are unable to acquire IPv6 addresses. What is the reason for this issue? 

A. Router advertisements are not sent by the router. 

B. Duplicate address detection is disabled but is required on multiaccess networks. 

C. The interface is configured to support DHCPv6 clients only. 

D. The configured interface MTU is too low for IPv6 to be operational. 

Answer:


Q209. Which three EIGRP packet types are valid? (Choose three.) 

A. open 

B. notification 

C. keep-alive 

D. hello 

E. query 

F. reply 

Answer: D,E,F 

Explanation: 

EIGRP uses the following packet types: hello and acknowledgment, update, and query and reply. 

Hello packets are multicast for neighbor discovery/recovery and do not require acknowledgment. An acknowledgment packet is a hello packet that has no data. Acknowledgment packets contain a nonzero acknowledgment number and always are sent by using a unicast address. 

Update packets are used to convey reachability of destinations. When a new neighbor is discovered, unicast update packets are sent so that the neighbor can build up its topology table. In other cases, such as a link-cost change, updates are multicast. Updates always are transmitted reliably. 

Query and reply packets are sent when a destination has no feasible successors. Query packets are always multicast. Reply packets are sent in response to query packets to instruct the originator not to recompute the route because feasible successors exist. Reply packets are unicast to the originator of the query. Both query and reply packets are transmitted reliably. 

Reference: http://docwiki.cisco.com/wiki/Enhanced_Interior_Gateway_Routing_Protocol 


Q210. Refer to the exhibit. 

Two multicast domains are configured as shown and connected with MSDP, but the two 

domains are unable to communicate. Which two actions can you take to correct the problem? (Choose two.) 

A. Change the peering IP address in AS 65220 to 10.0.0.20. 

B. Change the peering AS on R2 to 65210. 

C. Verify that UDP port 639 is open. 

D. Verify that TCP port 139 is open. 

E. Change the MSDP originator-id to GigabitEthernet 0/0/0 on both routers. 

F. Change the MSDP peering IP address on R2 to 172.16.1.13. 

Answer: A,B