A Level Computing - the internet structure 1.3.3 a&b

What is packet switching

• it examines the payload of a packet before allowing access.

• the packets are sent one after the other along a pre-established route.

• Packets of data are inspected by the firewall

• Packets are sent different routes to get to the computer.

What is circuit switching

• Packets are sent different routes to get to its destination.

• The packets are sent one after the other along a pre-established route.

• it examines the payload of a packet before allowing access.

• Packets of data are inspected by the firewall. The port must be opened for the duration of the connection

What is stateful inspection

• Packets of data are inspected by the firewall to check which port they are trying to access.

• packets are sent one after the other along a pre-established route

• it examines the payload of a packet before allowing access

• Packets are sent different routes to get to the destination computer.

What is packet filtering

• it examines the payload of a packet before allowing access and remembers actions for future decisions.

• Packets of data are inspected by the firewall to check which port they are trying to access.

• packets are sent one after the other along a pre-established route.

• Packets are sent different routes to get to the destination computer.

What is an IP address

• An address for a website

• a unique number that identifies the actual device that is connected to the internet or network.

• The address where protocols are located

• Identifies a unique computer connected to a TCP/IP

What is a MAC address

• a unique number that identifies the actual device that is connected to the internet or network.

• Identifies a network or a particular computer connected to TCP/IP

• The address of the nearest Mac shop

• The location of internet information

What defines the application layer

• applications and protocols operate at this layer.

• this adds the sender’s and recipient’s IP addresses to the packet, and packages the data to make it ready for transmission.

• the network interface card/controller (NIC) and operating system drivers are at this layer.

• this breaks down the message into packets. Each packet is given a packet number and the total number of packets.

Define the transport layer

• this adds the sender’s and recipient’s IP addresses to the packet, and packages the data to make it ready for transmission.

• the network interface card/controller (NIC) and operating system drivers are at this layer.

• applications and protocols operate at this layer.

• this breaks down the message into packets. Each packet is given a packet number and the total number of packets.

Define the network layer

• applications and protocols operate at this layer.

• this adds the sender’s and recipient’s IP addresses to the packet, and packages the data so it is ready for transmission. it routes the packets across the network.

• the network interface card/controller (NIC) and operating system drivers are at this layer.

• applications such as web browsers and email programs operate at this layer.

Define the link layer

• the network interface card/controller (NIC) and operating system drivers are at this layer.

• this breaks down the message into packets. Each packet is given a packet number and the total number of packets. This layer sets up the communication between hosts

• this adds the sender’s and recipient’s IP addresses to the packet, and packages the data so it is set for transmission. it routes the packets across the network.

• applications and protocols operate at this layer.