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comp > Comp Networks > Flashcards

Comp Networks Flashcards

1
Q

What do packet switches do?

A

forward packets (chunks of data)

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2
Q

give examples of some communication links

A

Fiber
Copper
Radio
Sattiliete

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3
Q

What are networks

A

collection of devices, routers

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4
Q

What are protocols

A

control sending, receiving of messages

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5
Q

How to connect end systems to edge router?

A

residential access nets
institutional access networks (school, company)
mobile access networks (WiFi, 4G/5G)

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6
Q

Give an example of a WLAN

A

WIFI in home

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7
Q

Give an example of wide-area cellular access networks

A

4G/5G

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8
Q

What do data centre networks do?

A

Connects hundreds. to thousands of servers together and to the internet

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9
Q

When does queueing occur

A

When work arrives faster than it can be serviced

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10
Q

What happens if the memory in the router fills up?

A

packets can be dropped

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11
Q

What does FDM stand for?

A

Frequency Division Multiplexing

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12
Q

What does TDM stand for?

A

Time Division Multiplexing

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13
Q

Why are protocols needed for packet switching

A

reliable data transfer and congestion control

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14
Q

Given millions of access ISP’s, how long does it take to connect them together?

A

O(N^2)

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15
Q

How does packet delay occur

A

Packets queue in router buffers, waiting for turn for transmission

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16
Q

what are the cleint and server roles in process communication

A

Client: process that initiates communications
Server: process that waits to be contacted

17
Q

What is the HTTP port number?

A

80

18
Q

How many bits are in a IP address

A

32

19
Q

What transport service does an app need?

A

Data integrity
Throughput
Timing
Security

20
Q

What does UDP service not provide

A

reliability, flow control, congestion control, timing, throughput guarantee, security or connection setup

21
Q

What does SMTP stand for and where is it used?

A

Simple mail transfer protocol
Emails

22
Q

Where is SMTP protocol located?

A

between mail servers to send email messages

23
Q

What are the three phases of SMTP transfer

A

SMTP handshaking (greeting)
SMTP transfer of messages
SMTP closure

24
Q

What is the SMTP port number?

A

220

25
Q

is HTTP stateless

A

yes

26
Q

What is the difference between persistent and non-persistent HTTP

A

Persistent: multiple objects can be sent over a single TCP connection between the server and the client

Non: only one object

27
Q

What is first party and third party cookies?

A

First party: tracking user behaviour on a given site
Third party: tracking user behaviour across multiple sites

28
Q

Give examples of some DNS services

A

hostname to ip address translation
host aliasing
mail server aliasing
load distribution

29
Q

Name some features about TCP

A

reliable, in-order delivery
congestion control
flow control
connection setup

30
Q

Name some features about UDP

A

unreliable, unordered delivery

comp (3 decks)

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