Layer 7

Layer 4

Layer 1

Layer 3

Manchester on R1 - Amplitude Modulation on R2

Manchester on R1 - NRZ on R2

Amplitude Modulation on R1 - Amplitude Modulation on R2

the window size

the destination MAC address

a port number

a sequence number

by applying the mask to the destination IP address

by checking its routing table

by testing with a broadcast message

by comparing its MAC address to that of the destination machine

The MAC addresses of the machines that A has contacted and that are in a different network than A

The MAC addresses of the machines that A has contacted and that are in the same network as A

The MAC addresses of the machines that the router of A's network has contacted

MAC addresses of all machines in the same network as A

Looking at the size of the message

A router only receives IP packets, so this is always the case

It looks at the value of the "length/type" field of the layer 2 Ethernet header

By looking if the MAC address matches 

In this encapsulation process, each layer (3 and 4) adds addresses of different types

In this encapsulation process, layer 4 adds information that is used by the routers routing the data to the destination

In this encapsulation process, layer 3 checks the message given by layer 4 before encapsulating it

In this encapsulation process, each layer (3 and 4) adds information necessary for the sending of the data to the destination application

When the two messages cross on the switch

When the two messages cross on the cable connecting the switch to machine B

When the two messages cross on one of the two machines