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INFOTECH 21 - Networking > Topic #11: The Network Layer > Flashcards

Topic #11: The Network Layer Flashcards

1
Q

It is the layer that provides services to exchange data over the network between end devices

A

Network Layer

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2
Q

Differences between the Network and Transport Layer

A

Transport layer connects processes while Network Layer enables devices to reach each other

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3
Q

4 Processes in the Network Layer

A

Addressing
Encapsulation
Routing
Decapsulation

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4
Q

Functions of the Network Layer

A
  • receives segments of data from the transport layer
  • uses protocols to add addressing information and other information and send it along the best path
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5
Q

Function of Network Layer Protocols

A
  • shares upper-layer information between hosts
  • specifies the addressing and packaging of a transport layer and describe how the PDU is to be carried with minimum overhead
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6
Q

Network Layer tasks to be performed

A
  • Addressing packets with an IP address
  • Encapsulation of Packets
  • Routing of Packets
  • Decapsulation of Packets
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7
Q

Devices in IP networks that have IP addresses

A

Hosts

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8
Q

IP address of the sending host

A

source IP address

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9
Q

IP address of the receiving host

A

destination IP address

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10
Q

This contains the address information and some other bits that identify the PDU as a network layer PDU

A

IP headeer

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11
Q

The process of adding the address information to the data

A

Encapsulation

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12
Q

When a level 4 PDU has been encapsulated what is it referred to?

A

Packet

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13
Q

It is the process routers perform when receiving packets, analyze address information, use the address information to select a path for the packet and forward it to the next router

A

Routing

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14
Q

Each route that a packet takes to reach the next device

A

Hop

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15
Q

It is the process of removing encapsulation data at different layers

A

Decapsulation

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16
Q

Where does the IP packet decapsulated

A

at the Final destination

17
Q

Network Layer protocols

A

IPv4
IPv6
Novell IPX
AppleTalk
Connectionless Network Service

18
Q

It is the most widely used network protocol

A

Internet Protocol version 4

19
Q

It is an network layer protocol that will work with IPv4 and will likely to replace it

A

IPv6

20
Q

A Widely popular internetworking protocol in the 1980s and 1990s

A

Novell IPX

21
Q

Apple Computer’s proprietary networking protocol

A

AppleTalk

22
Q

it is a common networking protocol used in telecommunication networks that does not require established circuits

A

Connectionless Network Service

23
Q

Characteristics of IPv4

A
  • Connectionless - receiving host is NOT contacted before the message is sent
  • Best Effort - IP does not have the capability to manage and recover, missing and corrupt packets
  • Independent - operates independently of the medium carrying the data
24
Q

Key fields in an IPv4 Header

A

IP Source Address
IP Destination Address
Time to Live
Type of Service
Protocol
Flag and Fragment Offset

25
Q

This IPv4 key field contains the host that will send the packet

A

IP Source Address

26
Q

This IPv4 key field contains the host that will receive the packet

A

IP Destination Address

27
Q

This IPv4 field describes the maximum hops a packet can take before it is considered “lost” or undeliverable

A

Time to Live

28
Q

This IPv4 field describes the level of throughput priority a router should use in processing a packet

A

Type of Service

29
Q

This IPv4 field describes upper-layer protocol

A

Protocol

30
Q

This IPv4 field describes whether to fragment a packet when forwarding it from one medium to another

A

Flag and Fragment Offset

31
Q

This IPv4 field describes whether it is version 4 or 6

A

Version

32
Q

This IPv4 field describes how long the header is

A

Internet Header Length

33
Q

This IPv4 field helps reassemble any fragments

A

Identification

34
Q

This IPv4 field describes the length of the header

A

Header Checksum

35
Q

This IPv4 field used rarely to provide special routing services

A

Options

36
Q

This IPv4 field is used when header does not end on a 32-bit boundary

A

Padding

37
Q

Basis to divide networks

A

*Purpose - users with similar software and bandwidth needs are grouped together
*Ownership - users that help in controlling access, administration and security are grouped together
Geographic Location - users that are in the same location are grouped together

38
Q

Reasons to Separate Hosts in a Network

A
  • Increase performance
  • Better Security
  • Better address management

INFOTECH 21 - Networking (14 decks)

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