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COMP 3721 Datacomm > Week 1 - Intro > Flashcards

Week 1 - Intro Flashcards

1
Q

What are the three Data Flows (Modes of communication)?

A

Simplex
Half-duplex
Full-duplex

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2
Q

What are the 5 components of a data communications system?

A

Sender
Receiver
Protocols
Message
Transmission Medium

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3
Q

What is a point-to-point connection?

A

A dedicated link between two devices.

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4
Q

What is a multi-point connection?

A

A link is used by multiple devices simultaneously

(link capacity shared or time-shared)

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5
Q

What are the 4 topologies?

A

Mesh - Complete graph, n*(n-1)/2 nodes

Star - All nodes have point to point connection to a hub

Bus - Multilink backbone cable with each node using a drop line.

Ring - Each node connected to device on either side using repeater.

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6
Q

What is the difference between a point-to-point and switched WAN?

A

A switched WAN connects more than two communication devices.

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7
Q

What is the backbone of the internet?

A

International ISPs

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8
Q

What is a provider network?

A

Regional ISPs

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9
Q

What is a peering point used for?

A

Efficient routing of data through various internet networks.

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10
Q

What are the 3 types of networks that can access the internet?

A

Telephone Network (DSL voice and data)
Cable network
Wireless network

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11
Q

What is a protocol and why are they needed?

A

Defines the format, actions, and order of messages exchanged between communicating entities.

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12
Q

What is protocol layering?

A

Breaking down communication into its components, which can then be implemented by software and hardware.

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13
Q

What are the 5 layers of TCP?

A

Application
Transport
Network
Data Link
Physical

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14
Q

What is the physical layer?
What is its packet name?

A

bits that are converted to signals, physical layer is dependent on the link/transmission medium

Bits

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15
Q

What is the data link layer?
What is its packet name and address?

A

Data transfer between devices in a network.

Frame
Link-layer address (MAC)

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16
Q

What is the network layer?
What is its packet name and address?

A

The network layer is host-to-host communication between different networks.

datagram
IP address

17
Q

What is the transport layer?
What is its packet name and address?

A

The transport layer is process-to-process, it ensures that the data is received by the correct application.

segment/user datagram
port

18
Q

What is the application layer?
What is its packet name and address?

A

The application layer is where the communication takes place, it is software that the end user interacts with.

Message
Names (ex: wbesite URL)

19
Q

What does the Network Interface Card do?

A

Implements the data-link and physical layer.

COMP 3721 Datacomm (5 decks)

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