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Xarxes d'Ordinadors i Internet [MO70514]

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An IP datagram D with total size 112 bytes, which contains 20 header bytes, is sent from a node in a network N1 (MTU=50) to another node in a network N2 (MTU=85). N1 and N2 are connected to different interfaces of the same router.

  • What are the 3 smaller fragment data offsets (in bytes) observed in N1 corresponding to D? < <
  • What are the 3 largest fragment data offsets (in bytes) observed in N2 corresponding to D? < <
  • How many fragments corresponding to D are observed in N1 with the 'More Fragments' flag set to 1?
  • How many fragments corresponding to D are observed in N2 with the 'More Fragments' flag set to 0?
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An IP datagram D with total size 209 bytes, which contains 20 header bytes, is sent from a node in a network N1 (MTU=85) to another node in a network N2 (MTU=50). N1 and N2 are connected to different interfaces of the same router.

  • What are the 3 smaller fragment data offsets (in bytes) observed in N1 corresponding to D? < <
  • What are the 3 largest fragment data offsets (in bytes) observed in N2 corresponding to D? < <
  • How many fragments corresponding to D are observed in N1 with the 'More Fragments' flag set to 1?
  • How many fragments corresponding to D are observed in N2 with the 'More Fragments' flag set to 0?
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What is the function of ARP in a network?
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Which ARP message is used by a computer to verify that the MAC address of another computer is still valid?
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We have a network with address 194.215.128.0/17

. We divide the

network into

four

subnets of equal size (with the maximum number of addresses in

each one). What are the addresses of the four subnets?

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We have a network with address 182.128.0.0/10

. We divide the

network into two subnets of equal size (with the maximum number of addresses in

each one). Type the subnet address in CIDR format of the subnet with the

lower network addres.

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We have a host with the IPv4 address 199.41.98.200

. We

also know that the network mask is

255.224.0.0

. Type the

network address

of the network where the host is located in dotted quadd

notation. Do not include the mask in the answer.

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We have a network with the address:

84.75.86.0/24

Answer the following questions about this network:

Q1: Write the broadcast address of this network in dotted quadd notation:

Q2: Which one of the following addresses belong to the network?:

Q3: Which one of the following addresses does NOT

belong to

the network?

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