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Q121. - (Topic 5) 

What is the purpose of the switchport command? 

Switch(config-if)# switchport port-security maximum 1 

Switch(config-if)# switchport port-security mac-address 0018.DE8B.4BF8 

A. It ensures that only the device with the MAC address 0018.DE8B.4BF8 will be able to connect to the port that is being configured. 

B. It informs the switch that traffic destined for MAC address 0018.DE8B.4BF8 should only be sent to the port that is being configured. 

C. It will act like an access list and the port will filter packets that have a source or destination MAC of 0018.DE8B.4BF8. 

D. The switch will shut down the port of any traffic with source MAC address of 0018.DE8B.4BF8. 

Answer:

Explanation: 

The first command configurs the maximum number of secure MAC addresses on a port to one. The next command specifies that MAC addresses that are allowed with port security; in this case it is just the one single device MAC. If any other device connects on that port the port will be shut down by the port security feature. 


Q122. - (Topic 5) 

Two routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit, but there is no data connectivity between them. The Atlanta router is known to have a correct configuration. 

Given the partial configurations shown in the exhibit, what is the problem on the Brevard router that is causing the lack of connectivity? 

A. A loopback is not set. 

B. The IP address is incorrect. 

C. The subnet mask is incorrect. 

D. The serial line encapsulations are incompatible. 

E. The maximum transmission unit (MTU) size is too large. 

F. The bandwidth setting is incompatible with the connected interface. 

Answer:

Explanation: 

The connection between two routers must have IP addresses that belong to the same subnet, but in this case Atlanta is using 192.168.10.1/24 and the other is in 192.168.11.1/24. 


Q123. - (Topic 2) 

What does a host on an Ethernet network do when it is creating a frame and it does not have the destination address? 

A. Drops the frame 

B. Sends out a Layer 3 broadcast message 

C. Sends a message to the router requesting the address 

D. Sends out an ARP request with the destination IP address 

Answer:

Explanation: 

In this case, it will send out an ARP request for MAC address of the destination IP (assuming it doesn't already have it in its table) and then address it to the destination's MAC address. 


Q124. - (Topic 2) 

Refer to the exhibit. 

How many collision domains are shown? 

A. one 

B. two 

C. three 

D. four 

E. six 

F. twelve 

Answer:

Explanation: 

Hubs create single collision and broadcast domains, so in this case there will be a single collision domain for each of the two hubs. 


Q125. - (Topic 3) 

Refer to the exhibit. 

Which command would you use to configure a static route on Router1 to network 192.168.202.0/24 with a nondefault administrative distance? 

A. router1(config)#ip route 1 192.168.201.1 255.255.255.0 192.168.201.2 

B. router1(config)#ip route 192.168.202.0 255.255.255.0 192.168.201.2 1 

C. router1(config)#ip route 5 192.168.202.0 255.255.255.0 192.168.201.2 

D. router1(config)#ip route 192.168.202.0 255.255.255.0 192.168.201.2 5 

Answer:

Explanation: 

The default AD for a static route is 1. To change this, configure a different value to be used as the AD at the very end of the “ip route” statement. 


Q126. - (Topic 3) 

Why do large OSPF networks use a hierarchical design? (Choose three.) 

A. to decrease latency by increasing bandwidth 

B. to reduce routing overhead 

C. to speed up convergence 

D. to confine network instability to single areas of the network 

E. to reduce the complexity of router configuration 

F. to lower costs by replacing routers with distribution layer switches 

Answer: B,C,D 

Explanation: 

OSPF implements a two-tier hierarchical routing model that uses a core or backbone tier known as area zero (0). Attached to that backbone via area border routers (ABRs) are a number of secondary tier areas. 

The hierarchical approach is used to achieve the following: 

. Rapid convergence because of link and/or switch failures 

. Deterministic traffic recovery 

. Scalable and manageable routing hierarchy, reduced routing overhead. 


Q127. - (Topic 1) 

On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or from another vendor? 

A. RTP 

B. TCP 

C. CDP 

D. UDP 

Answer:

Explanation: 

The Cisco Unified IP Phone uses CDP to communicate information such as auxiliary VLAN ID, per port power management details, and Quality of Service (QoS) configuration information with the Cisco Catalyst switch. Cisco Discovery Protocol (CDP) is a proprietary protocol designed by Cisco to help administrators collect information about both locally attached and remote devices. By using CDP, you can gather hardware and protocol information about neighbor devices, which is useful info for troubleshooting the network. CDP messages are generated every 60 seconds as multicast messages on each of its active interfaces. The information shared in a CDP packet about a Cisco device includes the following: Name of the device configured with the hostname command IOS software version Hardware capabilities, such as routing, switching, and/or bridging Hardware platform, such as 2600, 2950, or 1900 The layer-3 address(es) of the device The interface the CDP update was generated on 

Reference: http://computernetworkingnotes.com/cisco-devices-administration-and-configuration/cisco-discoveryprotocol.html 


Q128. - (Topic 2) 

Which address type does a switch use to make selective forwarding decisions? 

A. Source IP address 

B. Destination IP address 

C. Source and destination IP address 

D. Source MAC address 

E. Destination MAC address 

Answer:

Explanation: 

Switches analyze the destination MAC to make its forwarding decision since it is a layer 2 device. Routers use the destination IP address to make forwarding decisions. 


Q129. - (Topic 3) 

Which three statements are correct about RIP version 2? (Choose three) 

A. It uses broadcast for its routing updates. 

B. It supports authentication. 

C. It is a classless routing protocol. 

D. It has a lower default administrative distance then RIP version 1. 

E. It has the same maximum hop count as RIP version 1. 

F. It does not send the subnet mask any updates. 

Answer: B,C,E 

Explanation: 

A and E are correct according to the theory of RIP. 

RIP version 1 updates are broadcasts, and RIP version 2 updates are multicast to 

224.0.0.9 -> B is not correct. 

RIP v1 is a classful routing protocol but RIP v2 is a classless routing protocol -> C is 

correct. 

RIPv1 and RIPv2 have the same default administrative distance of 120 -> D is not correct. 

RIPv2 is a classless routing protocol so it does send the subnet mask in updates -> F is not 

correct. 


Q130. - (Topic 5) 

Refer to the exhibit. 

The network administrator is testing connectivity from the branch router to the newly installed application server. What is the most likely reason for the first ping having a success rate of only 60 percent? 

A. The network is likely to be congested, with the result that packets are being intermittently dropped. 

B. The branch router had to resolve the application server MAC address. 

C. There is a short delay while NAT translates the server IP address. 

D. A routing table lookup delayed forwarding on the first two ping packets. 

E. The branch router LAN interface should be upgraded to FastEthernet. 

Answer:

Explanation: 

Initially the MAC address had to be resolved, but once it is resolved and is in the ARP table of the router, pings go through immediately.