Cisco 100-101 Online Practice Questions and Exam Preparation

Cisco 100-101 Online Questions & Answers

• Question 41:

  Which two options will help to solve the problem of a network that is suffering a broadcast storm? (Choose two.)

  A. a bridge
  B. a router
  C. a hub
  D. a Layer 3 switch
  E. an access point
  B. a router
  D. a Layer 3 switch

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  Routers and layer 3 switches will not propagate broadcast traffic beyond the local segment, so the use of these devices is the best method for eliminating broadcast storms.

• Question 42:

  What does administrative distance refer to?

  A. the cost of a link between two neighboring routers
  B. the advertised cost to reach a network
  C. the cost to reach a network that is administratively set
  D. a measure of the trustworthiness of a routing information source
  D. a measure of the trustworthiness of a routing information source

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  http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml

  Administrative distance is the feature that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. Administrative distance is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route information for the same destination. Administrative distance is a measure of the trustworthiness of the source of the routing information. The smaller the administrative distance value, the more reliable the protocol.

• Question 43:

  Refer to the exhibit.

  

  If host A sends an IP packet to host B, what will the source physical address be in the frame when it reaches host B?

  A. 10.168.10.99
  B. 10.168.11.88
  C. A1:A1:A1:A1:A1:A1
  D. B2:B2:B2:B2:B2:B2
  E. C3:C3:C3:C3:C3:C3
  F. D4:D4:D4:D4:D4:D4
  E. C3:C3:C3:C3:C3:C3

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  When packets transfer from one host to another across a routed segment, the source IP address always remains the same source IP address, and the source physical (MAC) address will be the existing router's interface address. Similarly, the destination IP address always remains the same and the destination physical (MAC) address is the destination router's interface address.

• Question 44:

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

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  Initially the MAC address had to be resolved, but later on it was confirmed to ping went straight away

• Question 45:

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

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  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.

• Question 46:

  Select and Place: Select and Place:

  

  

• Question 47:

  In the configuration of NAT, what does the keyword overload signify?

  A. When bandwidth is insufficient, some hosts will not be allowed to access network translation.
  B. The pool of IP addresses has been exhausted.
  C. Multiple internal hosts will use one IP address to access external network resources.
  D. If the number of available IP addresses is exceeded, excess traffic will use the specified address pool.
  C. Multiple internal hosts will use one IP address to access external network resources.

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  http://evilrouters.net/2009/07/09/configuring-basic-nat-with-overloading/

  Overloading (having multiple clients all NAT'd to the same IP address) is probably the most common implementation (especially for those of us who run NAT on a Cisco box at home!).

• Question 48:

  Refer to the exhibit.

  

  A network device needs to be installed in the place of the icon labeled Network Device to accommodate a leased line attachment to the Internet. Which network device and interface configuration meets the minimum requirements for this installation?

  A. a router with two Ethernet interfaces
  B. a switch with two Ethernet interfaces
  C. a router with one Ethernet and one serial interface
  D. a switch with one Ethernet and one serial interface
  E. a router with one Ethernet and one modem interface
  C. a router with one Ethernet and one serial interface

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  Only a router can terminate a leased line attachment access circuit, and only a router can connect two different IP networks. Here, we will need a router with two interfaces, one serial connection for the line attachment and one Ethernet interface to connect to the switch on the LAN.

• Question 49:

  Which of the following IP addresses are valid Class B host addresses if a default Class B mask is in use? (Choose two.)

  A. 10.6.8.35
  B. 133.6.5.4
  C. 192.168.5.9
  D. 127.0.0.1
  E. 190.6.5.4
  B. 133.6.5.4
  E. 190.6.5.4

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  The IP addresses 133.6.5.4 and 190.6.5.4 are both valid Class B addresses when a default mask is in use. The Class B default mask is 255.255.0.0 and the range of valid addresses is 128.0.0.0- 191.255.255.255. The IP address 10.6.8.35 is a Class A address. The Class A default mask is 255.0.0.0 and the range of valid addresses is 1.0.0.0 - 127.255.255.255, with the exception of the range 127.0.0.1 - 127.255.255.255, which is reserved and cannot be assigned. The IP address

  192.168.5.9 is a Class C address. The Class C default mask is 255.255.255.0 and the range of valid addresses is 192.0.0.0 - 223.255.255.255. The IP address 127.0.0.1 is a Class A address, but it comes from a reserved portion that cannot be assigned. The range 127.0.0.1 - 127.255.255.255 is used for diagnostics, and although any address in the range will work as a diagnostic address, 127.0.0.1 is known as the loopback address. If you can ping this address, or any address in the 127.0.0.1 - 127.255.255.255 range, then the NIC is working and TCP/IP is installed. The Class A default mask is 255.0.0.0 and the range of valid addresses is 1.0.0.0 - 127.255.255.255, with the exception of the range 127.0.0.1 127.255.255.255, which is reserved and cannot be assigned.

  

• Question 50:

  What is the subnet address of 172.16.159.159/22?

  A. 172.16.0.0
  B. 172.16.128.0
  C. 172.16.156.0
  D. 172.16.159.0
  E. 172.16.159.128
  F. 172.16.192.0
  C. 172.16.156.0

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  Converting to binary format it comes to 11111111.11111111.11111100.00000000 or 255.255.252.0 Starting with 172.16.0.0 and having increment of 4 we get.