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Q21. - (Topic 5) 

Refer to the exhibit. 

A network administrator is troubleshooting a connectivity problem on the serial interfaces. The output from the show interfaces command on both routers shows that the serial interface is up, line protocol is down. Given the partial output for the show running-config in the exhibit, what is the most likely cause of this problem? 

A. The serial cable is bad. 

B. The MTU is incorrectly configured. 

C. The Layer 2 framing is misconfigured. 

D. The IP addresses are not in the same subnet. 

Answer:

Explanation: 

Here we see that Rtr3 is configured to use PPP encapsulation, but Rtr1 has not been configured for any kind of encapsulation. The default on Cisco router serial interfaces is HDLC, not PPP, so there is an encapsulation mismatch. 


Q22. - (Topic 5) 

Refer to the exhibit. 

A person is trying to send a file from a host on Network A of the JAX Company to a server 

on Network Z of the XYZ Company. The file transfer fails. The host on Network A can communicate with other hosts on Network A. 

Which command, issued from router RTA, would be the most useful for troubleshooting this problem? 

A. show flash: 

B. show history 

C. show version 

D. show interfaces 

E. show controllers serial 

Answer:

Explanation: 

The most useful thing to check on RTA would be the show interfaces command to see if the interface toward the WAN link is up. The most likely scenario is that the local LAN interface is up, but the other interface toward the XYZ company is down. 


Q23. - (Topic 1) 

Refer to the exhibit. 

Host A is sending a packet to Host B for the first time. What destination MAC address will Host A use in the ARP request? 

A. 192.168.0.1 

B. 172.16.0.50 

C. 00-17-94-61-18-b0 

D. 00-19-d3-2d-c3-b2 

E. ff-ff-ff-ff-ff-ff 

F. 255.255.255.255 

Answer: E Explanation: 

For the initial communication, Host A will send a broadcast ARP (all F's) to determine the correct address to use to reach the destination. ARP sends an Ethernet frame called an ARP request to every host on the shared link-layer legmen. The Ethernet header includes the source host MAC address and a destination address of all Fs representing a broadcast frame. The ARP request contains the sender's MAC and IP address and the target (destination) IP address. The target's MAC address is set to all 0s. ARP Request 

Reference: 

http://www.technicalhowto.com/protocols/arp/arp.html 


Q24. - (Topic 3) 

What information can be used by a router running a link-state protocol to build and maintain its topological database? (Choose two.) 

A. hello packets 

B. SAP messages sent by other routers 

C. LSAs from other routers 

D. beacons received on point-to-point links 

E. routing tables received from other link-state routers 

F. TTL packets from designated routers 

Answer: A,C 

Explanation: 

Reference 1: http://www.ciscopress.com/articles/article.asp?p=24090&seqNum=4 

Link state protocols, sometimes called shortest path first or distributed database protocols, are built around a well-known algorithm from graph theory, E. W. Dijkstra'a shortest path algorithm. Examples of link state routing protocols are: Open Shortest Path First (OSPF) for IP The ISO's Intermediate System to Intermediate System (IS-IS) for CLNS and IP DEC's DNA Phase V Novell's NetWare Link Services Protocol (NLSP) Although link state protocols are rightly considered more complex than distance vector protocols, the basic functionality is not complex at all: 

1.

 Each router establishes a relationship—an adjacency—with each of its neighbors. 

2.

 Each router sends link state advertisements (LSAs), some 

3.

 Each router stores a copy of all the LSAs it has seen in a database. If all works well, the databases in all routers should be identical. 

4.

 The completed topological database, also called the link state database, describes a graph of the internetwork. Using the Dijkstra algorithm, each router calculates the shortest path to each network and enters this information into the route table. OSPF Tutorial 


Q25. - (Topic 5) 

How can you ensure that only the MAC address of a server is allowed by switch port Fa0/1? 

A. Configure port Fa0/1 to accept connections only from the static IP address of the server. 

B. Configure the server MAC address as a static entry of port security. 

C. Use a proprietary connector type on Fa0/1 that is incomputable with other host connectors. 

D. Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address. 

Answer:

Explanation: 

When the MAC address is configured as static entry, no other address is allowed. 


Q26. - (Topic 2) 

How many simultaneous Telnet sessions does a Cisco router support by default? 

A. 1 

B. 2 

C. 3 

D. 4 

E. 5 

F. 6 

Answer:

Explanation: 

By default, Cisco routers support virtual terminal interfaces 0-4 (5 total) which are used for telnet sessions. 


Q27. - (Topic 1) 

Refer to the exhibit. 

HostX is transferring a file to the FTP server. Point A represents the frame as it goes toward the Toronto router. What will the Layer 2 destination address be at this point? 

A. abcd.1123.0045 

B. 192.168.7.17 

C. aabb.5555.2222 

D. 192.168.1.1 

E. abcd.2246.0035 

Answer:

Explanation: 

For packets destined to a host on another IP network, the destination MAC address will be the LAN interface of the router. Since the FTP server lies on a different network, the host will know to send the frame to its default gateway, which is Toronto. 


Q28. - (Topic 5) 

Refer to the exhibit. 

A technician is troubleshooting a host connectivity problem. The host is unable to ping a server connected to Switch_A. Based on the results of the testing, what could be the problem? 

A. A remote physical layer problem exists. 

B. The host NIC is not functioning. 

C. TCP/IP has not been correctly installed on the host. 

D. A local physical layer problem exists. 

Answer:

Explanation: 

Here we see that the host is able to ping its own loopback IP address of 127.0.0.1 and it’s own IP address of 10.0.0.35, so we know that the NIC is functioning and that the host’s TCP/IP stack is OK. However, it is not able to ping the IP address of its local default gateway, so we know that there is a local cabling problem between the switch and the router. 


Q29. - (Topic 5) 

The hosts in the LAN are not able to connect to the Internet. Which commands will correct this issue? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

Answer:

Explanation: 

Do a “show ip int brief” and you will see that Fa0/1 has an IP address assigned, but it is shut down. 


Q30. - (Topic 5) 

Refer to the exhibit. 

Serial 0/0 does not respond to a ping request from a host on the FastEthernet 0/0 LAN. How can this problem be corrected? 

A. Enable the Serial 0/0 interface. 

B. Correct the IP address for Serial 0/0. 

C. Correct the IP address for FastEthernet 0/0 

D. Change the encapsulation type on Serial 0/0 

E. Enable autoconfiguration on the Serial 0/0 interface 

Answer:

Explanation: 

Serial 0/0 interface is administratively down therefore, you will have to run the "no shutdown" command to enable the interface for data.