Cisco 100-101 Online Practice Questions and Exam Preparation

Cisco 100-101 Online Questions & Answers

• Question 61:

  

  

  Including the address on the Routed Ethernet interface, how many hosts can have IP addresses on the LAN to which Routed is connected?

  A. 6
  B. 30
  C. 62
  D. 126
  A. 6

  ---

  This is a /29 address, so there are 6 usable IP's on this subnet.

• Question 62:

  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.
  C. The Layer 2 framing is misconfigured.

• Question 63:

  Refer to the exhibit.

  

  The host in Kiev sends a request for an HTML document to the server in Minsk. What will be the source IP address of the packet as it leaves the Kiev router?

  A. 10.1.0.1
  B. 10.1.0.5
  C. 10.1.0.6
  D. 10.1.0.14
  E. 10.1.1.16
  F. 10.1.2.8
  E. 10.1.1.16

  ---

  Although the source and destination MAC address will change as a packet traverses a network, the source and destination IP address will not unless network address translation (NAT) is being done, which is not the case here.

• Question 64:

  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.

  

  

  

  

  R1 does not form an OSPF neighbor adjacency with R2. Which option would fix the issue?

  A. R1 ethernetO/1 is shutdown. Configure no shutdown command.
  B. R1 ethernetO/1 configured with a non-default OSPF hello interval of 25: configure no ip ospf hello- interval 25
  C. R2 ethernetO/1 and R3 ethernetO/O are configured with a non-default OSPF hello interval of 25; configure no ip ospf hello-interval 25
  D. Enable OSPF for R1 ethernetO/1; configure ip ospf 1 area 0 command under ethernetO/1
  B. R1 ethernetO/1 configured with a non-default OSPF hello interval of 25: configure no ip ospf hello- interval 25

  ---

  Looking at the configuration of R1, we see that R1 is configured with a hello interval of 25 on interface Ethernet 0/1 while R2 is left with the default of 10 (not configured).

  

• Question 65:

  What is the purpose of flow control?

  A. To ensure data is retransmitted if an acknowledgement is not received.
  B. To reassemble segments in the correct order at the destination device.
  C. To provide a means for the receiver to govern the amount of data sent by the sender.
  D. To regulate the size of each segment.
  C. To provide a means for the receiver to govern the amount of data sent by the sender.

  ---

  http://whatis.techtarget.com/definition/flow-control Flow control is the management of data flow between computers or devices or between nodes in a network so that the data can be handled at an efficient pace. Too much data arriving before

  a device can handle it causes data overflow, meaning the data is either lost or must be retransmitted. For serial data transmission locally or in a network, the Xon/Xoff protocol can be used. For modem connections, either Xon/Xoff or CTS/

  RTS (Clear to Send/Ready to Send) commands can be used to control data flow.

  In a network, flow control can also be applied by refusing additional device connections until the flow of traffic has subsided.

• Question 66:

  Refer to the exhibit.

  

  The exhibit is showing the topology and the MAC address table. Host A sends a data frame to host D. What will the switch do when it receives the frame from host A?

  A. The switch will add the source address and port to the MAC address table and forward the frame to host D.
  B. The switch will discard the frame and send an error message back to host A.
  C. The switch will flood the frame out of all ports except for port Fa0/3.
  D. The switch will add the destination address of the frame to the MAC address table and forward the frame to host D.
  A. The switch will add the source address and port to the MAC address table and forward the frame to host D.

  ---

  When switch receives the data frame from the host not having the MAC address already on the MAC table, it will add the MAC address to source port on MAC address table and sends the data frame.

• Question 67:

  OSPF is configured using default classful addressing. With all routers and interfaces operational, how many networks will be in the routing table of R1 that are indicated to be learned by OSPF?

  

  A. 2
  B. 3
  C. 4
  D. 5
  E. 6
  F. 7
  C. 4

• Question 68:

  Which commands are required to properly configure a router to run OSPF and to add network 192.168.16.0/24 to OSPF area 0? (Choose two.)

  A. Router(config)# router ospf 0
  B. Router(config)# router ospf 1
  C. Router(config)# router ospf area 0
  D. Router(config-router)# network 192.168.16.0 0.0.0.255 0
  E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0
  F. Router(config-router)# network 192.168.16.0 255.255.255.0 area 0
  B. Router(config)# router ospf 1
  E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0

  ---

  In the router ospf command, the ranges from 1 to 65535 so o is an invalid number -> but To configure OSPF, we need a wildcard in the "network" statement, not a subnet mask. We also need to assgin an area to this process -> .

• Question 69:

  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.
  B. Hellos are sent every 10 seconds.

  ---

  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 70:

  Which two of these functions do routers perform on packets? (Choose two.)

  A. Examine the Layer 2 headers of inbound packets and use that information to determine the next hops for the packets
  B. Update the Layer 2 headers of outbound packets with the MAC addresses of the next hops
  C. Examine the Layer 3 headers of inbound packets and use that information to determine the next hops for the packets
  D. Examine the Layer 3 headers of inbound packets and use that information to determine the complete paths along which the packets will be routed to their ultimate destinations
  E. Update the Layer 3 headers of outbound packets so that the packets are properly directed to valid next hops
  F. Update the Layer 3 headers of outbound packets so that the packets are properly directed to their ultimate destinations
  B. Update the Layer 2 headers of outbound packets with the MAC addresses of the next hops
  C. Examine the Layer 3 headers of inbound packets and use that information to determine the next hops for the packets

  ---

  This is the basic function of the router to receive incoming packets and then forward them to their required destination. This is done by reading layer 3 headers of inbound packets and update the info to layer 2 for further hopping.