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Q21. DRAG DROP 

Drag and drop the QoS requirement on the left to the correct QoS technology on the right. 

Answer: 


Q22. Which three features are common to OSPF and IS-IS? (Choose three.) 

A. They both maintain a link-state database from which a Dijkstra-based SPF algorithm computes a shortest path tree. 

B. They both use DR and BDR in the broadcast network. 

C. They both use hello packets to form and maintain adjacencies. 

D. They both use NSSA and stub type areas to scale the network design. 

E. They both have areas to form a two-level hierarchical topology. 

Answer: A,C,E 


Q23. Refer to the exhibit. 

At which location will the benefit of this configuration be observed? 

A. on Router A and its upstream routers B. on Router A and its downstream routers 

C. on Router A only 

D. on Router A and all of its ARP neighbors 

Answer:

Explanation: 

The following example shows how to configure the router (and downstream routers) to drop all options packets that enter the network: Router(config)# ip options drop 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/sel_drop.html 


Q24. What happens when an interface is configured as passive in OSPF? 

A. No OSPF neighbor ship is formed on the interface. 

B. An OSPF neighbor ship is formed with the DR, but not with the BDR. 

C. The subnet configured on the interface is not advertised to any other neighbor. 

D. OSPF hello messages are sent as unicast instead of multicast. 

Answer:


Q25. Refer to the exhibit. 

Route exchange is failing on a PE edge device configured with this VRF-Lite. Which action can you take to correct the problem? 

A. Configure the vrf-lite capability under the OSPF address families. 

B. Correct the route descriptors. 

C. Correct the OSPF router-ids. 

D. Configure the control plane with a larger memory allocation to allow the device to appear in the routing table. 

Answer:

Explanation: 

Open Shortest Path First version 3 (OSPFv3) operates in nondefault VPN routing and forwarding (VRF) instances for both IPv6 and IPv4 address families and, transports the routes across a Border Gateway Protocol (BGP) or a Multiprotocol Label Switching (MPLS) backbone. On the provider edge (PE) device, customer routes are installed together by OSPFv3 and BGP in a common VRF or address family and each protocol is configured to redistribute the routes of the other. BGP combines the prefixes redistributed into it with a route-distinguisher value defined for the VRF and advertises them to other MPLS-BGP speakers in the same autonomous system using the VPNv4 or VPNv6 address family as appropriate. The OSPFv3 route selection algorithm prefers intra-area routes across the back-door link over inter-area routes through the MPLS backbone. Sham-links are a type of virtual link across the MPLS backbone that connect OSPFv3 instances on different PEs. OSPFv3 instances tunnel protocol packets through the backbone and form adjacencies. Because OSPFv3 considers the sham-link as an intra-area connection, sham-link serves as a valid alternative to an intra-area back-door link. Domain IDs are used to determine whether the routes are internal or external. They describe the administrative domain of the OSPFv3 instance from which the route originates. Every PE has a 48-bit primary domain ID (which may be NULL) and zero or more secondary domain IDs. 

How to Configure VRF-Lite/PE-CE 

. Configuring a VRF in an IPv6 Address Family for OSPFv3 

SUMMARY STEPS 

1. enable 

2. configure terminal 

3. vrf definition vrf-name 

4. rd route-distinguisher 

5. exit 

6. router ospfv3 [process-id] 

7. address-family ipv6 [unicast] [vrf vrf-name] 

8. end 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro-15-sy-book/iro-vrf-lite-pe-ce.html 


Q26. Which two statements about the default SNMP configuration are true? (Choose two.) 

A. The SNMP agent is enabled. 

B. The SNMP trap receiver is configured. 

C. All SNMP notification types are sent. 

D. SNMPv1 is the default version. 

E. SNMPv3 is the default version. 

Answer: C,D 

Explanation: 

Default SNMP Configuration 

Feature 

Default Setting 

SNMP agent 

Enabled SNMP community strings 

Read-Only: Public 

Read-WritE. Private 

Read-Write-all: Secret 

SNMP trap receiver 

None configured 

SNMP traps 

None enabled 

SNMP version 

If no version keyword is present, the default is version 1. 

SNMPv3 authentication 

If no keyword is entered, the default is the noauth (noAuthNoPriv) security level. 

SNMP notification type 

If no type is specified, all notifications are sent. 

Reference: 

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_19_ea1/configuration/guide/2950scg/swsnmp.html 


Q27. Refer to the exhibit. 

Which action must you take to enable the WAN link to function properly? 

A. Enter a clock rate on the DCE interface. 

B. Enter a clock rate on the DTE interface. 

C. Enter a compression algorithm on both interfaces. 

D. Configure both interfaces for HDLC encapsulation. 

Answer:

Explanation: 

When connecting a serial cable to the serial interface of the router, clocking is provided by an external device, such as a CSU/DSU device. A CSU/DSU (Channel Service Unit/Data Service Unit) is a digital-interface device used to connect a router to a digital circuit. The router is the DTE (Data Terminal Equipment) and the external device is the DCE (Data Communications Equipment), where the DCE provides the clocking. However, in some cases we might connect two routers back-to-back using the routers’ serial interfaces (Example. Inside the router labs). Each router is a DTE by default. Since clocking is required to enable the interface, one of the two routers should function as DCE and should provide clocking. This can be done by using the "clock rate" command, from the interface configuration mode. 

Reference: http://www.omnisecu.com/cisco-certified-network-associate-ccna/how-to-configure-router-serial-interfaces.php 


Q28. DRAG DROP 

Drag and drop the path-selection criteria on the left into the correct route-selection order on the right, that a router will use when having multiple routes toward the same destination. 

Answer: 


Q29. Which option is the default maximum age of the MAC address table? 

A. 300 seconds 

B. 500 seconds 

C. 1200 seconds 

D. 3600 seconds 

Answer:

Explanation: 

To configure the maximum aging time for entries in the Layer 2 table, use the mac-address-table aging-time command in global configuration mode. 

Syntax Description 

seconds 

MAC address table entry maximum age. Valid values are 0, and from 5 to 1000000 seconds. Aging time is counted from the last time that the switch detected the MAC address. The default value is 300 seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/lanswitch/command/reference/lsw_book/lsw_m1. html 


Q30. When deploying redundant route reflectors in BGP, which attribute can you configure on the route reflector to allow routes to be identified as belonging to the same group? 

A. ROUTER_ID 

B. CLUSTER_ID 

C. ORIGINATOR_ID 

D. PEER_GROUP 

Answer:

Explanation: 

Together, a route reflector and its clients form a cluster. When a single route reflector is deployed in a cluster, the cluster is identified by the router ID of the route reflector. The bgp cluster-id command is used to assign a cluster ID to a route reflector when the cluster has one or more route reflectors. Multiple route reflectors are deployed in a cluster to increase redundancy and avoid a single point of failure. When multiple route reflectors are configured in a cluster, the same cluster ID is assigned to all route reflectors. This allows all route reflectors in the cluster to recognize updates from peers in the same cluster and reduces the number of updates that need to be stored in BGP routing tables. 

Reference: http://ieoc.com/forums/t/5326.aspx