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COSC203 > COSC203 - PART || > Flashcards

COSC203 - PART || Flashcards

1
Q

Another name for chunks of data that are forwarded within the network

A

Packets

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2
Q

The term for the transmission rate that a communication link provides

A

Bandwidth

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3
Q

A _____ is a collection of devices, routers and links that are managed by an organisation.

A

network

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4
Q

Internet is the network of _______

A

networks

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5
Q

This sits at the network edge

A

The host

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6
Q

The host is responsible for _____ data and ______ data.

A

Sending, receiving

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7
Q

When the host sends data, the ______ is broken into smaller chunks known as packets

A

Application message

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8
Q

How does the host perform the receive function?

A

The host will reassemble packets to generate the application message.

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9
Q

Why are the send/receive functions done in chunks?

A

The network would be overloaded, too large of a request

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10
Q

The two wires in the twisted pair cable represent what?

A

One carries signal, and the other is used as a ground reference.

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11
Q

What is an advantage of an STP over a UTP?

A

STP provides protection for interference

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12
Q

Why are the cables twisted for wired links?

A

Twisting ensures the noise interference is uniformly distributed.

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13
Q

What is the maximum distance for a wired link?

A

Less than 100 meters.

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14
Q

A _____ cable is a central core inner conductor

A

coaxial

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15
Q

A coaxial cable provides what?

A

Long distance at a high speed

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16
Q

Fibre optic cables are _____ speed and a ____ error rate.

A

high, low

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17
Q

WiFi, bluetooth, and satellite are all types of ____ links

A

Wireless links

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18
Q

The entire packet must arrive at the router before it can be transmitted on the next link. This is an example of….

A

Storing and forwarding.

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19
Q

When work arrives faster than it can be serviced, this is an example of….

A

Packet queueing

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20
Q

The network forwards packets from one router to the next, across links on a path from ______ to ______

A

source, destination

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21
Q

This type of switching is end-to-end, and resources cannot be reservred.

A

Circuit switching

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22
Q

T/F: No single institution owns the internet

A

True

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23
Q

The internet is many ____ together

A

subnets

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24
Q

ISP stands for…

A

Internet Service Provider

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25
Q

If ISPS aren’t ____ then you can’t ______

A

connected, communicate

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26
Q

This network has national and international coverage

A

Tier-1 commercial ISPs

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27
Q

This type of network is private and connects its data centres to the internet

A

Content provider networks

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28
Q

This protocol establishes rules that dictate how to format, transmit and receive data so that the network devices can communicate

A

Network protcol

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29
Q

Network protocols define a ______ for data, so that the receiver can understand what is in the packet

A

format

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30
Q

An ____ structure allows for identification of the system’s pieces

A

explicit

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31
Q

How many layers does the TCP/IP reference model contain?

A

5

32
Q

Name the 5 layers of the TCP/IP reference model

A

Application, transport, network, link, and physical

33
Q

The _____ layer divides application data into small chunks and adds a header that contains information for the destination so it knows where to forward the data to.

A

transport

34
Q

The ______ layer is responsible for communicating from one host to another.

A

Network

35
Q

The _____ layer contains headers or pillars that contain information for a dedicated link.

A

Link

36
Q

This layer sends data using signals

A

Physical

37
Q

The OSI reference model has ___ extra layers that aren’t implemented

A

two

38
Q

What are the two extra layers in the OSI reference model?

A

Presentation and session

39
Q

The max rate a link or network can theoretically transmit

A

Bandwidth

40
Q

This is the actual rate a link or network is transmitting

A

Throughput

41
Q

When there is a delay at a single router

A

Nodal delay

42
Q

This kind of delay represents the total delay to send a packet from source to destination

A

End-to-end delay

43
Q

Nodal delay, end-to-end delay, bandwidth, throughput, packet loss are all types of

A

Network performance metrics

44
Q

This type of metric means that the queue has a finite capacity

A

Packet loss

45
Q

This architecture has two parts, one of which is always on and often in data centres.

A

Client-server architecture

46
Q

This architecture has two end systems that directly communicate

A

P2P

47
Q

This sort of architecture decentralises the resources on a network

A

P2P

48
Q

The network application running within a host

A

Process

49
Q

Processes in different hosts communicate by _______

A

exchanging messages

50
Q

This address differentiates processes in different hosts

A

IP address

51
Q

This differentiates processes within the same host

A

Port number

52
Q

Message syntax, message semantics, communication rules are all types of…

A

Functions in an application protocol

53
Q

In Web and HTTP, the client in a client-server model is what?

A

A browser that requests, receives and “displays” web objects

54
Q

In Web and HTTP, the server in a client server model is what?

A

The web server that sends objects in response to requests made by the client

55
Q

HTTP stands for

A

Hypertext Transfer Protocol

56
Q

What is the difference between HTTP and HTTPS?

A

HTTPS is an extension of HTTP for secure communication and uses TLS

57
Q

What protocol does HTTP use for communication?

A

Transport layer protocol

58
Q

What methods does the TCP perform?

A

GET, HEAD, POST, PUT, DELETE, LINK, UNLINK

59
Q

How does caching improve load time?

A

Once any name server learns mapping, it caches mapping and immediately returns a mapping in response to a query.

60
Q

What line in a packet capture specifies the date of cached copy in an HTTP request?

A

If-Modified-Since

61
Q

The server returns this error if the response contains no object because of the cached copy being up to date.

A

HTTP/1.0 304 Not Modified

62
Q

What are the three major components of email?

A

User agents, mail servers, and protocols.

63
Q

What are the four email protocols?

A

SMTP, POP, IMAP, MIME

64
Q

POP is _____ but limited in _____

A

simple, functionality

65
Q

_____ has more features than _____

A

IMAP, POP

66
Q

Which protocol allows users to check the headers before downloading?

A

IMAP

67
Q

This protocol allows non-ASCII data to be sent through emails

A

MIME

68
Q

DNS is a translation between ____ and _____

A

IP address, host name

69
Q

DNS is implemented using a _____ system

A

distributed database

70
Q

What is a benefit of caching?

A

It improves response time

71
Q

T/F: You can set cached entries to time out

A

True (using TTL)

72
Q

This is a software component characterised by a combination of the local/remote IP address and port number.

A

A socket

73
Q

A socket API is usually provided by the _____

A

Operating system

74
Q

What is the difference between socket programming with TCP vs UDP?

A

In TCP, the client must first contact the server to set up a connection. In UDP, there is no connection between the client and the server.

75
Q

Does TCP or UDP provide reliable transfer?

A

TCP - in-order byte stream transfer.

COSC203 (6 decks)

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