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TI502M - Networks 2: Communication Protocols and Applications

TI502M - Networks 2: Communication Protocols and Applications

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Given the following configuration, which route is correct on machine A to reach machine B?

Destination: 10.2.1.0/16, next router: 10.2.1.3

❌

Destination: 10.2.0.0/16, next router: 10.2.1.3

❌

Destination: 10.2.1.0/16, next router: 10.1.1.3

❌

Destination: 10.2.0.0/16, next router: 10.1.1.3

✅

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Which statement is correct regarding the IP protocol ?

It retransmits the message in case of collision

❌

It avoids overloading the network by limiting the flow

❌

It puts back in order the messages at the reception

❌

It allows machines to perform the necessary actions that allow messages to reach a remote destination

✅

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A router receives a packet with a destination IP address that matches its address and a MAC address that is different from its address. What does it do with the packet?

It discards the packet at layer 3

❌

It considers that the packet was intended for it

❌

It routes it to the machine that has the destination MAC address

❌

It rejects the packet at layer 2

✅

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Why does a machine need both IP address and a MAC address to send a message to another machine?

To guarantee uniqueness of the destination and to be sure that it is the right destination

❌

Because a message can pass through several machines to reach the destination

✅

To allow the receiving machine to check that the message is sent to it

❌

Because an IP address is not stable

❌

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How does a machine get the MAC address of another machine on the same network?

The MAC address of the machines on the same network are given in the configuration

❌

By sending an ARP request in broadcast

✅

By sending an ARP request in unicast to the target machine

❌

MAC addresses are published on a server that the machine will request

❌

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Two machines A and B are on two different networks interconnected by routers on the Internet. To allow communication between A and B, which proposition is correct?

A and B must use the same protocols on all layers

❌

A and B can use different Layer 4 protocols

❌

A and B must use the same type of physical medium

❌

A and B and all routers must use the same Layer 3 protocol

✅

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Why do we need a Layer 3 protocol if Layer 2 protocols can identify machines with a MAC address?

To manage the flow of data

❌

To provide a security layer

❌

To carry data to the application

❌

To interconnect machines belonging to different networks

✅

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We have a network that we want to divide into 2 subnetworks. We use the address 10.0.0.0/10 as a starting address. Which of the following addresses could be given to one of the two networks?

10.64.0.0/12

10.192.0.0/12

10.0.0.32/16

10.128.0.0/11

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How does a machine check if it has the MAC address of the machine to contact ?

By looking in its routing table

❌