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TM129: Networking > Module 7: Routing between networks > Flashcards

Module 7: Routing between networks Flashcards

1
Q

what other term might be used to describe a

Local Area Network (LAN)

A

this may also be known as an

intranet

intranet describes how LANs have changed over time from very small single networks to its own network of networks containing large amounts of hosts

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2
Q

the reasons you might perform this are:

  1. Broadcast containment
  2. Security requirements
  3. Physical locations
  4. Logical grouping
A

name 4 reasons why you might

divide a single network on the access layer into multiple networks

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3
Q

name 4 reasons why you might

divide a single network on the access layer into multiple networks

A

the reasons you might perform this are:

  1. Broadcast containment
  2. Security requirements
  3. Physical locations
  4. Logical grouping
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4
Q

this is typically described as a network that is under the control of a single entity such as a business

A

how can a

Local Area Network (LAN)

be described

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5
Q

how does dividing a network enable

logical grouping

A

Sometimes we may divide up a network into logical groupings to maintain an organised network or so that hosts that have a common need can all access the resources that only they need. Such as accounting hosts being on the accounting network that has all the accounting servers which store the accounting data

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6
Q
  • these are used to join different networks together
  • they are concerned with routing data to there intended destination based upon the network portion of the IP address
  • they are not concerned about individual hosts but only the destination network
A

what are routers

  • used for
  • what are they concerned about
  • what are they not concerned about
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7
Q

Sometimes we may divide up a network into logical groupings to maintain an organised network or so that hosts that have a common need can all access the resources that only they need. Such as accounting hosts being on the accounting network that has all the accounting servers which store the accounting data

A

how does dividing a network enable

logical grouping

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8
Q

this is an address configured on one of the routers interfaces which is used when the router cannot determine a route for the packet

if this has not been configured then the packet would be dropped

A

what is a

default route

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9
Q

this is a table held by the router and contains a list of every interface of the router as well as the associated IP network connected to that interface

A

what is a

routing table

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10
Q

size

these can vary in size from tens of hosts to hundreds

location

although usually contained in one building these can span multiple buildings or geographical locations

technologies

these typically use technology such as ethernet and wireless protocols

A

descrribe the:

  • size
  • location
  • technologies

of a Local Area Network (LAN)

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11
Q

a router can have this configured / populated either:

  1. dynamically by receiving information from other routers
  2. manually by a network administrator
A

how is a

routing table

configured / populated

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12
Q

when a router recieves a packet what 4 actions can it take

A

upon receiving and reading a packet this will take 1 of these 3 actions:

  1. if the packet is addressed to a network directly attached to this, it will create a new ethernet frame and forward the message directly to the destination host
  2. if the packet is addressed to a remote network that it knows about then it will forward the packet to the router that can get the packet to its correct network again a new ethernet frame will be created
  3. if the packet is addressed to an unkown network but the router has a default route configured then it will send the packet to the default route
  4. if the packet is addressed to an unknown network and the router has no default route configured then it will drop the packet
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13
Q

how does dividing a network up enable

broadcast containment

A

We may divide up a local network so that we can reduce the number of broadcast messages that will exist on that network. To many hosts on a network ends up creating a lot of unnecessary and useless traffic in the form of broadcasts

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14
Q

how is a

routing table

configured / populated

A

a router can have this configured / populated either:

  1. dynamically by receiving information from other routers
  2. manually by a network administrator
How well did you know this?
1
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15
Q

this may also be known as an

intranet

intranet describes how LANs have changed over time from very small single networks to its own network of networks containing large amounts of hosts

A

what other term might be used to describe a

Local Area Network (LAN)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

how can a

Local Area Network (LAN)

be described

A

this is typically described as a network that is under the control of a single entity such as a business

17
Q

how does dividing up a network

increase security

A

We may divide up a network for security purposes. For example routers or other devices on the distribution layer may restrict access to a certain network also hosts that reside on different networks become invisible to each other

18
Q

what is a

routing table

A

this is a table held by the router and contains a list of every interface of the router as well as the associated IP network connected to that interface

19
Q

how does dividing a network enable that network to span multiple

physical locations

A

we may divide up a local network because either a network is in a different physical location but still must belong to the organisations local network in this example routers on the distribution layer could have wan links installed to the other network while maintaining the local network

20
Q

We may divide up a local network so that we can reduce the number of broadcast messages that will exist on that network. To many hosts on a network ends up creating a lot of unnecessary and useless traffic in the form of broadcasts

A

how does dividing a network up enable

broadcast containment

21
Q

what is a

default route

A

this is an address configured on one of the routers interfaces which is used when the router cannot determine a route for the packet

if this has not been configured then the packet would be dropped

22
Q

we may divide up a local network because either a network is in a different physical location but still must belong to the organisations local network in this example routers on the distribution layer could have wan links installed to the other network while maintaining the local network

A

how does dividing a network enable that network to span multiple

physical locations

23
Q

We may divide up a network for security purposes. For example routers or other devices on the distribution layer may restrict access to a certain network also hosts that reside on different networks become invisible to each other

A

how does dividing up a network

increase security

24
Q

descrribe the:

  • size
  • location
  • technologies

of a Local Area Network (LAN)

A

size

these can vary in size from tens of hosts to hundreds

location

although usually contained in one building these can span multiple buildings or geographical locations

technologies

these typically use technology such as ethernet and wireless protocols

25
Q

what are routers

  • used for
  • what are they concerned about
  • what are they not concerned about
A
  • these are used to join different networks together
  • they are concerned with routing data to there intended destination based upon the network portion of the IP address
  • they are not concerned about individual hosts but only the destination network
26
Q

upon receiving and reading a packet this will take 1 of these 3 actions:

  1. if the packet is addressed to a network directly attached to this, it will create a new ethernet frame and forward the message directly to the destination host
  2. if the packet is addressed to a remote network that it knows about then it will forward the packet to the router that can get the packet to its correct network again a new ethernet frame will be created
  3. if the packet is addressed to an unkown network but the router has a default route configured then it will send the packet to the default route
  4. if the packet is addressed to an unknown network and the router has no default route configured then it will drop the packet
A

when a router recieves a packet what 4 actions can it take

TM129: Networking (19 decks)

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