Designing Cisco Network Service Architectures
Question No: 141
Which technology provides a layer 2 loop free and does not contain a port state named quot;Blockingquot;?
Question No: 142
Which network virtualization plane is used to separate traffic forwarding tables?
Question No: 143
Which multicast address must be available for FHRP advertisements in a multivendor environment?
Question No: 144
Transition to Named EIGRP without causing an outage?
router eigrp NAME
router eigrp 1 named NAME
router eigrp 1
eigrp upgrade-cli NAME
ip router eigrp 1 named NAME
Question No: 145
On which two types of links should routing protocol peerings be established according to best practice? (Choose two.)
end user links
Answer: C,D Explanation:
Question No: 146
Out of band management. What is the best practice Cisco design?
Data traffic should never pass or enter the management network
In-band management as backup
Enable dynamic routing
Answer: A Explanation:
quot;An OOB management network should be deployed using the following best practices:
鈥rovide network isolation
鈥nforce access control
鈥revent data traffic from transiting the management networkquot;
Question No: 147
Which of these statements best describes VPLS?
Neither broadcast nor multicast traffic is ever flooded in VPLS.
Multicast traffic is flooded but broadcast traffic is not flooded in VPLS.
VPLS emulates an Ethernet switch, with each EMS being analogous to a VLAN.
Because U-PE devices act as IEEE 802.1 devices, the VPLS core must use STP
When the provider experiences an outage, IP re-routing restores PW connectivity and MAC re-learning is needed.
Question No: 148
An engineer is attempting to improve OSPF network performance and discovers that the entire SPT
recomputes whenever a type 1 or type 2 LSA is received within an area. Which action can optimize SPT operations?
Tune LSA throttling thresholds.
Enable incremental SPF.
Configure totally stubby areas throughout the domain.
Summarize networks on all ABRs.
Answer: B Explanation:
quot;Benefits of OSPF Incremental SPF OSPF uses Dijkstra#39;s SPF algorithm to compute the shortest path tree (SPT). During the computation of the SPT, the shortest path to each node is discovered. The topology tree is used to populate the routing table with routes to IP networks. When changes to a Type-1 or Type-2 link-state advertisement (LSA) occur in an area, the entire SPT is recomputed. In many cases, the entire SPT need not be
recomputed because most of the tree remains unchanged. Incremental SPF allows the system to recompute only theaffected part of the tree. Recomputing only a portion of the tree rather than the entire tree results in faster OSPF convergence and saves CPU resources. Note that if the change to a Type-1 or Type-2 LSA occurs in the calculating router itself, then the full SPT is performed.
Incremental SPF is scheduled in the same way as the full SPF. Routers enabled with incremental SPF and routers not enabled with incremental SPF can function in the same internetwork.quot;
Question No: 149
Refer to the exhibit.
The Cisco Nexus 1000V in the VMware vSphere solution effectively creates an additional access layer in the virtualized data center network; which of the following 1000V characteristics can thedesigner take advantage of?
Offloads the STP requirement from the external Access layer switches
If upstream access switches do not support vPC or VSS the dual-homed ESX host traffic can still be distributed using virtual port channel host mode using subgroups automatically discovered through CDP
Allows transit traffic to be forwarded through the ESX host between VMNICs
Can be divided into multiple virtual device contexts for service integration, enhanced security, administrative boundaries, and flexibility of deployment
Answer: B Explanation:
quot;Virtual Port Channel Host Mode Virtual Port Channel Host Mode (vPC-HM), shown in Figure 5-33 , allows a port channel from the Cisco Nexus 1000V to be terminated on two separate upstream switches, even if these switches do not support a clustering technology, such as vPC or VSS.quot;
Question No: 150
The network designer needs to consider the number of multicast applications and sources in the network to provide the most robust network possible. Which of the following is a consideration the designer must also address?
The IGPs should utilize authentication to avoid being the most vulnerable component
With SSM source or receiver attacks are not possible
With Shared Trees access control is always applied at the RP
Limit the rate of Register messages to the RP to prevent specific hosts from being attacked on a PIM-SM network
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