chp 9 nat Flashcards

1
Q

ipv4 private address space

A
  • not enough ip addresses
  • private addresses are used within organizations
  • not routed on internet
  • must be translated by nat
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2
Q

network address translation (nat)

A
  • to conserve public ipv4 addresses
  • implemented at border network devices
  • private addresses are translated to public addresses
  • internal address is hidden
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3
Q

static nat

A
  • one to one mapping of local and global addresses
  • configured by network admin and remain constant
  • useful when internal servers must be accessible from the outside network
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4
Q

dynamic nat

A
  • uses pool of public addresses
  • assigns them on first come first serve basis
  • requires enough public addresses to satisfy all simultaneous users
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5
Q

port address translation (pat)

A
  • maps multiple private ip addresses to public ip addresses
  • uses the pair source port and source ip address to keep track of what traffic belongs to each client
  • aka nat overload
  • validates that incoming packets were requested, added security
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6
Q

benefits of nat

A
  • conserves ip addresses
  • increases the flexibility of connections to the public network
  • provides consistency for internal network addressing schemes
  • provides network security
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7
Q

disadvantages of nat

A
  • worse performance
  • end to end addressing is lost
  • end to end traceability is lost
  • initiating tcp connections can be interrupted
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8
Q

port forwarding

A
  • forwarding a network port from one network node to another
  • a packet sent to a public ip and port of a router can be forwarded to a private ip and port inside the network
  • useful when server with private ip needs to be reached from outside network
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