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Computer Networking > Network Fundamentals > Flashcards

Network Fundamentals Flashcards

1
Q

Frames are a PDU on what layer?

A

Layer 2

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2
Q

What is the PDU for layer 3?

A

Packet

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3
Q

What is layer 7 in the OSI model?

A

Application

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4
Q

What is layer 6 in the OSI model?

A

Presentation

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5
Q

What is layer 5 on the OSI model?

A

Session

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6
Q

What layer does encryption and decryption occur in the OSI model?

A

Layer 6, presentation

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7
Q

What is layer 4 on the OSI model?

A

Transport

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8
Q

Name protocols on layer 4

A

TCP and UDP on the transport layer

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9
Q

Describe TCP

A

Transmission Control Protocol
Connection oriented (Delivery confirmation)
Sequencing and segmentation
Reliable delivery

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10
Q

Describe UDP

A

User Datagram Protocol
Connectionless (No delivery confirmation)
No sequencing or segmentation
Best effort delivery

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11
Q

Name layer 3 of the OSI model.

A

Network

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12
Q

What does the network layer do?

A

Routing
Logical Addressing
IP, ICMP NAT, OSPF

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13
Q

What is layer 2 of the OSI model?

A

Data Link

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14
Q

What happens at layer 2?

A 
Flow control
Acknowledgements
Error detection
Logical Link Control
Media Access Control
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15
Q

What is layer 1 of the OSI model?

A

Physical

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16
Q

What happens at layer 1?

A

Electrical and mechanical characteristics
per cable, fiber optic cable
IEEE 1394 and BASE standards

17
Q

What is IGP?

A 
Interior Gateway Protocols are routing protocols used within an 
autonomous system (AS), such as company routers.
18
Q

What is EGP?

A

Exterior Gateway Protocols are used to map routes between

autonomous systems and are mainly utilized by ISPs.

19
Q

What is RIP?

A

Routing Information Protocol –

  • The RIP hop count metric will choose the path with the least amount of hops, where hops refer to routers.
  • Max number of hops is 15
  • RIP operates in layer 7 (OSI) and uses port 520 (UDP)
  • Default AD value is 120
20
Q

What is OSPF?

A

Open Shortest Path First – The OSPF metric is based on cumulative
bandwidth from source to destination. OSPF will
choose the path with the highest bandwidth.

21
Q

What is Distance Vector?

A

Distance vector is a routing algorithm that calculates the best path for a packet
based on the factors of distance and vector.

22
Q

What is distance with respect to dynamic routing?

A

Distance: The distance between the router and the destination network, based on
the metric of number of hops (routers)

23
Q

What is vector with respect to dynamic routing?

A

Vector: The outgoing interface and the direction to the path that leads to the
destination network

Computer Networking (4 decks)

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