ENetwork Chapter 7

1   
What is a characteristic of a logical point-to-point topology?

•     The media access control protocol can be very simple.

   
2   
What are three characteristics of valid Ethernet Layer 2 addresses? (Choose three.)

•     They are 48 binary bits in length.
•     They are considered physical addresses.
•     They are generally represented in hexadecimal format.

   
3   
What two facts are true when a device is moved from one network or subnet to another? (Choose two.)

•     The device will still operate at the same Layer 2 address.
•     The Layer 3 address must be reassigned to allow communications to the new network.

4   
What is a primary purpose of encapsulating packets into frames?

•     facilitate the entry and exit of data on media

   
5   
Which options are properties of contention-based media access for a shared media? (Choose three.)

•     non-deterministic
•     less overhead
•     collisions exist

   
6   
What is the purpose of the preamble in an Ethernet frame?
    is used for timing synchronization
   
7   
What is a function of the data link layer?

•     provides for the exchange data over a common local media

8   
What statements are true regarding addresses found at each layer of the OSI model? (Choose two.)

•     Layer 2 may identify devices by a physical address burned into the network card
•     Layer 3 represents a hierarchical addressing scheme

   
9   

Refer to the exhibit. How many CRC calculations will take place as traffic routes from the PC to the laptop?

•     8

   
10   
What is the primary purpose of the trailer in a data link layer frame?

•     support frame error detection

   
11   
Which sublayer of the data link layer prepares a signal to be transmitted at the physical layer?

•     MAC

   
12   

Refer to the exhibit. A frame is being sent from the PC to the laptop. Which source MAC and IP addresses will be included in the frame as it leaves RouterB? (Choose two.)

•     source MAC - Fa0/1 on RouterB
•     source IP - PC

   
13   
What is true concerning physical and logical topologies?

•     Logical topologies consist of virtual connections between nodes.

14   

Refer to the exhibit. Which statement describes the media access control methods that are used by the networks in the exhibit?

•     Network 1 uses CSMA/CD and Network 3 uses CSMA/CA.

   
15   
Which three factors should be considered when implementing a Layer 2 protocol in a network? (Choose three.)

•     the geographic scope of the network
•     the physical layer implementation
•     the number of hosts to be interconnected

   
16   
What is true regarding media access control? (Choose three.)

•     Ethernet utilizes CSMA/CD
•     defined as placement of data frames on the media
•     Data Link layer protocols define the rules for access to different media

   
17   
A network administrator has been asked to provide a graphic representation of exactly where the company network wiring and equipment are located in the building. What is this type of drawing?

•     physical topology

   
18   
Which statements describe the logical token-passing topology? (Choose two.)

•     Computers are allowed to transmit data only when they possess a token.
•     Electronic tokens are passed sequentially to each other.

   
19   
What determines the method of media access control? (Choose two.)

•     media sharing
•     logical topology

   
20   

Refer to the exhibit. Assuming that the network in the exhibit is converged meaning the routing tables and ARP tables are complete, which MAC address will Host A place in the destination address field of Ethernet frames destined for www.server?

•     00-0c-85-cf-65-c0

Posted in: ENetwork