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Q17. 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: C 

Q18. DRAG DROP 

What is the correct order of the VSS initialization process? Drag the actions on the left to the correct initialization step on the right. 

Answer: 

Q19. Which two methods can you use to limit the range for EIGRP queries? (Choose two.) 

A. Use an access list to deny the multicast address 224.0.0.1 outbound from select EIGRP neighbor and permit everything else. 

B. Configure route tagging for all EIGRP routes. 

C. Summarize routes at the boundary routers of the EIGRP domain. 

D. Configure unicast EIGRP on all routers in the EIGRP domain. 

E. Configure stub routers in the EIGRP domain. 

F. Use an access list to deny the multicast address 224.0.0.10 outbound from select EIGRP neighbors and permit everything else. 

Answer: C,E 

Q20. DRAG DROP 

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

Answer: 

Q21. Which two options are reasons for TCP starvation? (Choose two.) 

A. The use of tail drop 

B. The use of WRED 

C. Mixing TCP and UDP traffic in the same traffic class 

D. The use of TCP congestion control 

Answer: C,D 

Explanation: 

It is a general best practice to not mix TCP-based traffic with UDP-based traffic (especially Streaming-Video) within a single service-provider class because of the behaviors of these protocols during periods of congestion. Specifically, TCP transmitters throttle back flows when drops are detected. Although some UDP applications have application-level windowing, flow control, and retransmission capabilities, most UDP transmitters are completely oblivious to drops and, thus, never lower transmission rates because of dropping. When TCP flows are combined with UDP flows within a single service-provider class and the class experiences congestion, TCP flows continually lower their transmission rates, potentially giving up their bandwidth to UDP flows that are oblivious to drops. This effect is called TCP starvation/UDP dominance. TCP starvation/UDP dominance likely occurs if (TCP-based) Mission-Critical Data is assigned to the same service-provider class as (UDP-based) Streaming-Video and the class experiences sustained congestion. Even if WRED or other TCP congestion control mechanisms are enabled on the service-provider class, the same behavior would be observed because WRED (for the most part) manages congestion only on TCP-based flows. 

Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/Qo S-SRND-Book/VPNQoS.html 

Q22. 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: A 

Q23. In the DiffServ model, which class represents the highest priority with the highest drop probability? 

A. AF11 

B. AF13 

C. AF41 

D. AF43 

Answer: D 

Explanation: 

AF43 — Assured forwarding, high drop probability, Class 4 DSCP, and Flash-override precedence. 

Table of AF Classes and Drop Priority 

Drop Precedence 

Class 1 

Class 2 

Class 3 

Class 4 

Low drop 

AF11 

DSCP 10 

001010 

AF21 

DSCP 18 

010010 

AF31 

DSCP 26 

011010 

AF41 

DSCP 34 

100010 

Medium drop 

AF12 

DSCP 12 

001100 

AF22 

DSCP 20 

010100 

AF32 

DSCP 28 

011100 

AF42 

DSCP 36 

100100 

High drop 

AF13 

DSCP 14 

001110 

AF23 

DSCP 22 

010110 

AF33 

DSCP 30 

011110 

AF43 

DSCP 38 

100110 

Reference: 

https://www.informit.com/library/content.aspx?b=CCIE_Practical_Studies_II&seqNum=56 

Q24. Which two statements about route summarization are true? (Choose two.)

A. RIP, IGRP, and EIGRP can automatically summarize routing information at network address boundaries. 

B. EIGRP can automatically summarize external routes. 

C. The area range command can aggregate addresses on the ASBR. 

D. The summary-address command under the router process configures manual summarization on RIPv2 devices. 

E. The ip classless command enables classful protocols to select a default route to an unknown subnet on a network with other known subnets. 

Answer: A,E