[2021-New] Cisco 100-105 Dumps With Update Exam Questions (3-12)

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New Cisco 100-105 Exam Dumps Collection (Question 3 - Question 12)

Question No: 3

Scenario

Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links.

You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices.

An OSPF neighbor adjacency is not formed between R3 in the main office and R6 in the Branch3 office. What is causing the problem?

A. There is an area ID mismatch.

B. There is a PPP authentication issue; the username is not configured on R3 and R6.

C. There is an OSPF hello and dead interval mismatch.

D. The R3 router ID is configured on R6.

Answer: D

Explanation:

Using the show running-config command we see that R6 has been incorrectly configured with the same router ID as R3 under the router OSPF process.

Question No: 4

After the network has converged, what type of messaging, if any, occurs between R3 and R4?

A. No messages are exchanged

B. Hellos are sent every 10 seconds.

C. The full database from each router is sent every 30 seconds.

D. The routing table from each router is sent every 60 seconds.

Answer: B

Explanation:

HELLO messages are used to maintain adjacent neighbors so even when the network is converged, hellos are still exchanged. On broadcast and point-to-point links, the default is 10 seconds, on NBMA the default is 30 seconds.

Although OSPF is a link-state protocol the full database from each router is sent every 30 minutes (not seconds) therefore, C and D are not correct.

Question No: 5

Refer to the exhibit.

A user cannot reach any web sites on the Internet, but others in the department are not having a problem.

What is the most likely cause of the problem?

A. IP routing is not enabled.

B. The default gateway is not in the same subnet.

C. A DNS server address is not reachable by the PC.

D. A DHCP server address is not reachable by the PC.

E. NAT has not been configured on the router that connects to the Internet.

Answer: C

Explanation:

Answer C is only answer that makes sense. IP routing does not need to be enabled on PCu2021s, this is a router function. We can see from the output that the PC and default gateway are on the same subnet. DHCP has not been enabled on this PC so it has been configured with a static address so reaching the DHCP server is not the issue. Finally, NAT must be configured correctly or the other users in the department would also be having issues.

Question No: 6

A workstation has just resolved a browser URL to the IP address of a server. What protocol will the workstation now use to determine the destination MAC address to be placed into frames directed toward the server?

A. HTTP

B. DNS

C. DHCP

D. RARP

E. ARP

Answer: E

Explanation:

The RARP protocol is used to translate hardware interface addresses to protocol addresses. The RARP message format is very similar to the ARP format. When the booting computer sends the broadcast ARP request, it places its own hardware address in both the sending and receiving fields in the encapsulated ARP data packet. The RARP server will fill in the correct sending and receiving IP addresses in its response to the message. This way the booting computer will know its IP address when it gets the message from the RARP server

Question No: 7

Refer to the exhibit.

A network has been planned as shown. Which three statements accurately describe the areas and devices in the network plan? (Choose three.)

A. Network Device A is a switch.

B. Network Device B is a switch.

C. Network Device A is a hub.

D. Network Device B is a hub.

E. Area 1 contains a Layer 2 device.

F. Area 2 contains a Layer 2 device.

Answer: A,D,E

Explanation:

Switches use a separate collision domain for each port, so device A must be a switch. Hubs, however, place all ports in the same collision domain so device B is a hub. Switches reside in layer 2 while hubs are layer 1 devices.

Question No: 8

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router?

A. 2

B. 8

C. 16

D. unlimited

Answer: B

Explanation:

Maximum-paths (OSPF)

To control the maximum number of parallel routes that Open Shortest Path First (OSPF) can support, use the maximum-paths command.

Syntax Description

maximum

Maximum number of parallel routes that OSPF can install in a routing table. The range is from 1 to 16 routes.

Command Default

8 paths

Question No: 9

Refer to the exhibit.

If the resume command is entered after the sequence that is shown in the exhibit, which router prompt will be displayed?

A. Router1>

B. Router1#

C. Router2>

D. Router2#

Answer: C

Explanation:

After resuming the telnet session by using the Enter key after it has been suspended, it will resume back to the telnet session so it will be back to the router2> prompt.

Question No: 10

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: A

Explanation:

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

Question No: 11

What are two recommended ways of protecting network device configuration files from outside network security threats? (Choose two.)

A. Allow unrestricted access to the console or VTY ports.

B. Use a firewall to restrict access from the outside to the network devices.

C. Always use Telnet to access the device command line because its data is automatically encrypted.

D. Use SSH or another encrypted and authenticated transport to access device configurations.

E. Prevent the loss of passwords by disabling password encryption.

Answer: B,D

Explanation:

Using a firewall is a must for networks of any size to protect the internal network from outside threats and unauthorized access. SSH traffic is encrypted while telnet is not, so it is always recommended to use SSH.

Question No: 12

What happens when computers on a private network attempt to connect to the Internet through a Cisco router running PAT?

A. The router uses the same IP address but a different TCP source port number for each connection.

B. An IP address is assigned based on the priority of the computer requesting the connection.

C. The router selects an address from a pool of one-to-one address mappings held in the lookup table.

D. The router assigns a unique IP address from a pool of legally registered addresses for the duration of the connection.

Answer: A

Explanation:

Reference: http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/nat_staticpat.html

Static PAT translations allow a specific UDP or TCP port on a global address to be translated to a specific port on a local address. That is, both the address and the port numbers are translated.

Static PAT is the same as static NAT, except that it enables you to specify the protocol (TCP or UDP) and port for the real and mapped addresses. Static PAT enables you to identify the same mapped address across many different static statements, provided that the port is different for each statement. You cannot use the same mapped address for multiple static NAT statements.

Port Address Translation makes the PC connect to the Internet but using different TCP source port.

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