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CCST > Exam Prep: Network Access - Questions > Flashcards

Exam Prep: Network Access - Questions Flashcards

1
Q

Rory is studying the fields inside an Ethernet frame for an upcoming test and notices that the destination Media Access Control (MAC) address is listed first before the source MAC address. Which of the following protocol characteristics is Rory investigating?

A

encapsulation

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2
Q

As Rory continues to study Ethernet, he discovers that a frame can typically be 64 to 1518 bytes of information that is converted into a series of bits before being sent out on the network. Which two protocol characteristics did Rory learn about for Ethernet?

A

encoding and message size

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3
Q

Protocols

A

The rules that govern network communications including the message format, message size, timing, and encapsulation

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4
Q

IP protocol

A

Governs communication from the original Source all the way to the Final Destination

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5
Q

TCP protocol

A

a communications standard that enables application programs and computing devices to exchange messages over a network

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6
Q

HTTP protocol

A

Governs the exchange or transfer of HTML

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7
Q

What are the categories function in the TCP/IP model?

A

Application, transport, internet, and network access

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8
Q

Application (TCP/IP model Layer)

A

Represents data to the user, plus encoding and digital control.

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9
Q

Transport (TCP/IP model layer)

A

Supports communication between various devices across diverse Networks

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10
Q

Internet (TCP/IP model layer)

A

Determines the best path through the network

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11
Q

Network access (TCP/IP model layer)

A

Controls the hardware devices and media that make up the network

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12
Q

Protocol model

A

This model closely matches the structure of a particular protocol suite. All Protocols that provide the functionality required for people to communicate with the data network. Describes the functions that occur at each layer of protocols within the TCP/IP suite

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13
Q

Reference model

A

Describes the functions that must be completed at a particular layer, but does not specify exactly how a function should be accomplished. Primary purpose of a reference model is to aid in clearer understanding of the functions and processes necessary for network communications.

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14
Q

What are the OSI Model Layers?

A

Application, presentation, session, transport, Network, data link, and physical

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15
Q

Application OSI Model layer 7

A

The application layer contains protocols used for the application layer contains protocols used for process to process communication

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16
Q

Presentation OSI Model layer 6

A

The presentation layer provides for common representation from the data transfer between application layer services

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17
Q

Session OSI Model layer 5

A

The session layer provides services to the presentation layer to organize its dialogue and manage data exchange

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18
Q

Transport OSI Model layer 4

A

The transport layer to find services to segments, transfer, and reassemble the data from Individual communication between the end devices

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19
Q

Network OSI Model layer 3

A

The network layer provides services to exchange the individual pieces of data over the network between identified end devices

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20
Q

Data link OSI Model layer 2

A

The data link layer protocols methods for exchanging data frames between devices over a common media

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21
Q

Physical OSI Model layer 1

A

The physical layer protocol describes the mechanical, electrical, functional, and procedural means to advance,, deactivate physical connections for a bit transmission to and from the network

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22
Q

What are some of the similarities between the TCP/IP model work with the OSI model?

A

The transport and network layers

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23
Q

In what ways does the TCP/IP model work with the OSI model differ?

A

OSI Layer 3, the network layer, maps directly to the TCP/IP internet layer. This layer is used to describe protocols that address and route messages through an internetwork.

OSI Layer 4, the transport layer, maps directly to the TCP/IP transport layer. This layer describes general services and functions that provide ordered and reliable delivery of data between source and destination hosts.

24
Q

Which protocol is responsible for guaranteeing reliable delivery?

A

Transport Control Protocol (TCP) is responsible for guaranteeing reliable delivery

25
Q

Which protocol is used by routers to forward messages?

A

Internet Protocol (IP) is used by routers to forward messages.

26
Q

Which two layers of the OSI Model maps directly as the single network access layer in the TCP/IP model? (Think chart)

A

Data Link and Physical

27
Q

IP addressing occurs at what layer of the OSI Model?

A

Network

28
Q

What is the purpose of the OSI physical layer?

A

transmitting bits across the local media

29
Q

What networking term describes a particular set of rules at one layer that governs communication at that layer?

A

Protocol

30
Q

Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices?

A

transport

31
Q

Which three layers of the OSI model make up the application layer of the TCP/IP model?

A

session, presentation, and application

32
Q

Which two OSI model layers have the same functionality as a single layer of the TCP/IP model?

A

OSI data link and physical layers together are equivalent to the TCP/IP network access layer

33
Q

What are the three most common network cables?

A

twisted-pair, coaxial cable, and fiber-optic cable

34
Q

Twisted-Pair Cable

A

Ethernet technology generally uses twisted-pair cables to interconnect devices

35
Q

Coaxial Cable

A

Coaxial was one of the earliest types of network cabling developed. Coaxial cable is the kind of copper cable used by cable TV companies

36
Q

Fiber-Optic Cable

A

Fiber-optic cable can be either glass or plastic with a diameter about the same as a human hair and it can carry digital information at very high speeds over long distances

37
Q

What is ethernet for?

A

Network interface card to Network interface card on the same network

38
Q

Network Interface Card (NIC)

A

How a device access the Ethernet LAN.

39
Q

Media Access Control (MAC) address

A

Each Ethernet NIC has a unique address permanently embedded on the card. The MAC address for both the source and destination are fields in an Ethernet frame.

40
Q

What is an example of encapsulation?

A

The process of placing one message format (the letter) inside another message format (the envelope)

41
Q

What is an example of De-encapsulation?

A

the process is reversed by the recipient and the letter is removed from the envelope

42
Q

What is an example of Frame?

A

A frame acts like an envelope; it provides the address of the intended destination and the address of the source host. The format and contents of a frame are determined by the type of message being sent and the channel over which it is communicated.

43
Q

What are the steps in an ethernet frame?

A

Preamble, Start Frame Delimiter, Destination Mac Address, Length Type, DATA, and Frame Check Sequence

44
Q

When an Ethernet frame is sent out an interface, the destination MAC address indicates:

A

The MAC address of the device, which is on this network, that will receive the Ethernet frame.

45
Q

The Ethernet protocol is at what layer of the OSI Model?

A

Layer 2 Data Link

46
Q

What level of the OSI model do Ethernet switches work on and why?

A

Layer 2 Data Link because they make forwarding decisions on info in the data link

47
Q

What is a MAC address table?

A

Where the switch stores information about the other Ethernet interfaces to which it is connected on a network. The table enables the switch to send outgoing data (Ethernet frames) on the specific port required to reach its destination, instead of broadcasting the data on all ports (flooding)

48
Q

When a Switch is sending an IP Packet down what port will it use?

A

All the ports until it finds a port with the correct destination mac address

49
Q

Ethernet switches make their forwarding decision based on what field of the Ethernet frame?

A

Destination MAC address

50
Q

Ethernet switches add entries to their MAC address table based on what field of the Ethernet frame?

A

source MAC address

51
Q

When a switch receives an Ethernet frame and the destination MAC address of that frame is not in its MAC address table, the switch will:

A

Forward the frame out all ports except in the incoming port.

52
Q

What will a Layer 2 switch do when the destination MAC address of a received frame is not in the MAC table?

A

It forwards the frame out of all ports except for the port at which the frame was received.

53
Q

What addressing information is recorded by a switch to build its MAC address table?

A

the source Layer 2 address of incoming frames

54
Q

What is the purpose of the FCS field in a frame?

A

to determine if errors occurred in the transmission and reception

55
Q

Which three fields are found in an 802.3 Ethernet frame?

A

Frame check sequence, destination physical address, and ? source physical address

56
Q

What will a host on an Ethernet network do if it receives a frame with a unicast destination MAC address that does not match its own MAC address?

A

It will discard the frame

57
Q

Which information does a switch use to keep the MAC address table information current?

A

To maintain the MAC address table, the switch uses the source MAC address of the incoming packets and the port that the packets enter

CCST (13 decks)

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