[Free] 2017(June) Ensurepass Testking Cisco 300-320 Actual Tests 191-200

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Designing Cisco Network Service Architectures (ARCH)

QUESTION 191

Which action can be taken on a multiaccess segment with OSPF speakers to reduce the performance impact during widespread convergence events?

 

A.

Separate the network into multiple areas for each new multiaccess segment.

B.

Enable LSA throttling in the core to slow link state advertisement updates during times of network instability.

C.

Ensure that the elected DR or BDR router can support high-volume convergence events.

D.

Verify that fewer than 50 OSPF speakers are on the segment.

Correct Answer: B

Explanation:

http://blog.ine.com/2010/06/02/ospf-fast-convergenc/

 

“It is worth noting that three most important timers to tune network for sub-second convergence are the failure detection delay, initial LSA generation delay and initial SPF delay. All other timers, such as hold and maximum time serve the purpose of stabilizing network, and affect convergence in “worst-case” unstable network scenarios.”

 

More info on LSA throttling:

https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsolsath.html

 

“Benefits of OSPF LSA Throttling Prior to the OSPF LSA Throttling feature, LSA generation was rate-limited for 5 seconds. That meant that changes in an LSA could not be propagated in milliseconds, so the OSPF network could not achieve millisecond convergence. The OSPF LSA Throttling feature is enabled by default and allows faster OSPF convergence (in milliseconds). This feature can be customized. One command controls the generation (sending) of LSAs and another command controls the receiving interval. This feature also provides a dynamic mechanism to slow down the frequency of LSA updates in OSPF during times of network instability.”

 

 

QUESTION 192

What is the correct state between two BGP peers that are neighbors?

 

A.

active

B.

operational

C.

established

D.

up

 

Correct Answer: C

 

 

QUESTION 193

DRAG DROP

Drag the IS-IS fast convergence components on the left to the order in which they occur on the right.

 

clip_image002

 

Correct Answer:

clip_image004

 

 

QUESTION 194

Which option is a benefit of site-to-site VPNs?

 

A.

Less configuration required than a WAN circuit

B.

More secure than a dedicated WAN circuit

C.

Less expensive than a dedicated WAN circuit

D.

More reliable than a dedicated WAN circuit

 

Correct Answer: C

 

 

QUESTION 195

Distinct, physical redundancy within a network layer is a key characteristic that contributes to the high availability of the hierarchical network design. Which of the following is not an examples of this model?

 

A.

SAN extension with dual fabrics such as a yellow VSAN and a blue VSAN utilized via multipath software

B.

Redundant power supplies and hot-swappable fan trays in Aggregate switches

C.

A single SAN fabric with redundant uplinks and switches

D.

Servers using network adapter teaming software connected to dual-attached access switches

 

Correct Answer: A

 

 

QUESTION 196

When designing data centers for multitenancy, which two benefits are provided by the implementation of VSAN and zoning? (Choose two)

 

A.

VSAN provides a means of restricting visibility and connectivity among devices connected to a zone

B.

VSANs have their own set of services and address space, which prevents an issue in one VSAN from affecting others

C.

Zones provide the ability to create many logical SAN fabrics on a single Cisco MDS 9100 family switch

D.

VSANs and zones use separate fabrics

E.

Zones allow an administrator to control which initiators can see which targets

 

Correct Answer: BE

 

 

 

 

QUESTION 197

OTV relies on which underlying protocol?

 

A.

EIGRP

B.

IS-IS

C.

OSPF

D.

BGP

 

Correct Answer: B

 

 

QUESTION 198

Which QoS mechanism uses PHBs?

 

A.

DiffServ

B.

IntServ

C.

CoS

D.

ToS

 

Correct Answer: A

 

 

QUESTION 199

A designer should have which three technologies in the network before configuring MPLS Layer 3 VPNs? (Choose three.)

 

A.

MPLS

B.

LDP

C.

Cisco Express Forwarding

D.

VSS

E.

vPC

F.

VRRP

 

Correct Answer: ABC

 

 

QUESTION 200

Which two design concerns must be addressed when designing a multicast implementation? (Choose two.)

 

A.

only the low-order 23 bits of the MAC address are used to map IP addresses

B.

only the low-order 24 bits of the MAC address are used to map IP addresses

C.

only the high-order 23 bits of the MAC address are used to map IP addresses

D.

only the low-order 23 bits of the IP address are used to map MAC addresses

E.

the 0x01004f MAC address prefix is used for mapping IP addresses to MAC addresses

F.

the 0x01005e MAC address prefix is used for mapping IP addresses to MAC addresses

 

Correct Answer: AF

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