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CSE 589: Modern Network Concepts > Chapter 1 > Flashcards

Chapter 1 Flashcards

1
Q

What is the internet?

A

It is a combination of software and hardware.

Network infrastructure that provides services to different apps.

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2
Q

Hosts/end systems

A

any device connected to the internet

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3
Q

Communication Links consist of what?

A

Coax, copper wire, optical fibre, and radio spectrum

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4
Q

Transmission Rate

A

measured in bits/sec

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5
Q

Packets

A

segments of data with header

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6
Q

Packet switches

A

routers or link-layer switches

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7
Q

Distributed apps

A

involve multiple end systems that exchange data with each other

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8
Q

Internet Apps

A

run on end systems

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9
Q

API

A

specifies how a program on a end system asks internet infrastructure to deliver data to a specific destination program running on another end system

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10
Q

What is a protocol

A

It is a set of actions specified to define the format/order of messages exchanged between two or more communicating entities

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11
Q

Access Network

A

physically connects end systems to first router on a path from the end system to any other distant end systems

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12
Q

Home Access Exmaples

A

DSL, Cable, FTTH, Dial-up, Satellite

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13
Q

DSLAM

A

DSL access multiplexing- converts signal from digital to analog

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14
Q

Cable network

A

requires DSLAM from analog to digital and terminates at CMTS

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15
Q

Wifi

A

most prevalent in corporate, university, and home networks

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16
Q

3G/LTE

A

Uses a base station to connect phones

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17
Q

Physical media types

A

radio, satellite, cable

18
Q

Example of unguided vs guided medium

A

Wifi-unguided, cable-guided

19
Q

End to End Delay Example

A

N-Number of links

R-transmission rate

L-length of one packet

20
Q

How does the router determine which link to forward to?

A

1) forwarding table: maps dest address to routers outbound links
2) end-to-end: asks directions

21
Q

Circuit Vs Packet Switched networks

A

Circuit-resources are reserved for a duration of the session

Packet switched-resources are not reserved

22
Q

FDM

A

Frequency is divided among established connections

23
Q

TDM

A

Divides the time into frames of fixed duration and each frame is divided and has a fixed number of time slots

24
Q

Does the ISP provide internet services?

A

No, Service provider does

25
Q

Types of ISPS

A

Regional, Tier 1

Regional-connects regions of ISP’s

Tier 1-connects regional to Tier 1

26
Q

Throughput

A

Amount of data that can be transfered

27
Q

Processing Delay

A

Time requested to examine packet’s header and determine where to direct the packet, time check for bit-level errors

28
Q

Queuing delay

A

packet waits in queue

29
Q

Transmission Delay

A

Time requested to propogate

30
Q

D Nodal delay formula

A

delay = delay(Proc + Queue + Trans + Prop)

31
Q

When is queuing delay large?

A

WHEN TRAFFIC INTENSITY IS GREATER THAN 1

32
Q

Service Model

A

1) Perform Action
2) Use services (layers above)

33
Q

What is a protocol stack?

A

Protocols of various layers (taken together)

34
Q

Top Down Approach

A

App –> Trans –> Net –> Link –> Phys

Consists of only five layers

35
Q

What is the application layer?

A

Where apps and app layer protocols reside

ex) HTTP, FTP, and DNS

36
Q

What is the transport layer?

A

Transports app messages

EX) TCP, UDP

37
Q

What is the Network Layer?

A

Responsible for moving datagrams from 1 host to another

38
Q

What is a datagram

A

Network layer packets

39
Q

What is the Link Layer?

A

Delivers datagram to next node and frames link layer packets

40
Q

What is the physical layer?

A

Move individual bits inframe from 1 node to the next

41
Q

OSI Model?

A

7 layers

42
Q

What is encapsulation?

A

To enclose or append data

CSE 589: Modern Network Concepts (1 decks)

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