Cisco ARCH Designing Cisco Network Service Architectures Set 3

1.

Which statement correctly describes a situation in which VRFs are used in the data center?

Partitioning of network resources is enabled. VRFs cannot support path isolation from MAN/WAN designs. VRFs cannot be used to map a virtualized data center to a MPLS implementation. VRFs do not allow for the use of application services with multiple access topologies. An access design using a VRF allows for an aggregation layer service module solution.

2.

Which statement about data center access layer design modes is correct?

The access layer is the first oversubscription point in a data center design. When using a Layer 2 loop-free design, VLANs are extended into the aggregation layer. When using a Layer 2 looped design, VLANs are not extended into the aggregation layer. When using a Layer 3 design, stateful services requiring Layer 2 connectivity are provisioned from theaggregation layer. The data center access layer provides the physical-level connections to the server resources and onlyoperates at Layer 3.

3.

When a router has to make a rate transition from LAN to WAN, what type of congestion needs should be considered in the network design?

TX-queue starvation TX-queue deferred RX-queue saturation TX-queue saturation RX-queue starvation

4.

To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus?

to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2

link to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3link to two core switches from redundant distribution switches connected with a Layer 2 link to two core switches from redundant distribution switches connected with a Layer 3 link to two core switches running Cisco NSF and SSO from two redundant distribution switches running CiscoNSF and SSO

5.

Which of these statements is correct regarding SSO and Cisco NSF?

Utilizing Cisco NSF in Layer 2 environments can reduce outages to one to three seconds. Utilizing SSO in Layer 3 environments can reduce outages to one to three seconds. Distribution switches are single points of failure causing outages for the end devices. Utilizing Cisco NSF and SSO in a Layer 2 environment can reduce outages to less than one second. NSF and SSO with redundant supervisors have the most impact on outages at the access layer.

6.

Which of these is a correct description of SSO?

It will only become active after a software failure. It will only become active after a hardware failure. It requires that Cisco NSF be enabled in order to work successfully. It synchronizes the MAC, FIB, and adjacency tables between Active and Standby Route Processors.

7.

Which of these recommended designs provides the highest availability?

map the Layer 2 VLAN number to the Layer 3 subnet control route propagation to edge switches using distribute lists use a Layer 2 distribution interconnection link with HSRP or GLBP use a Layer 3 distribution interconnection link with HSRP or GLBP use equal-cost Layer 3 load balancing on all links to limit the scope of queries in EIGRP

8.

What is the recommended practice regarding UDLD when implementing it in all fiber-optic LAN ports?

Adjust the default hello timers to three seconds for aggressive mode. Enable it in global mode and on every interface you need to support. Enable it in global mode to support every individual fiber-optic interface. Enable it to create channels containing up to eight parallel links between switches. Enable it in global mode to support every individual fiber optic and Ethernet interface.

9.

Which of these technologies is characterized as being a multipoint Layer 2 VPN that connects two or more customer devices using Ethernet bridging techniques?

DPT MPLS VPLS CWDM DWDM

10.

Your MPLS implementation is currently using internal backdoor links. What can you do to minimize the impact of having these links?

use BGP as the CE-PE routing protocol use OSPF as the CE-PE routing protocol use EIGRP as the CE-PE routing protocol use the SP to redistribute routes as external routes for OSPF and EIGRP use route redistribution at each location to ensure external routes are imported into the IGP

Cisco ARCH Designing Cisco Network Service Architectures Set 3

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