Protocols
-Define the rules that govern the communications between two
computers connected to the network.
-Roles: addressing and routing of messages, error detection and
recovery, sequence and flow controls etc.
-A protocol specification consists of the syntax, which defines the kinds
and formats of the messages exchanged, and the semantic, which
specifies the action taken by each entity when specific events occur.
Example: HTTP protocol for communication between web browsers
and servers.
-Define the rules that govern the communications between two
computers connected to the network.
-Roles: addressing and routing of messages, error detection and
recovery, sequence and flow controls etc.
-A protocol specification consists of the syntax, which defines the kinds
and formats of the messages exchanged, and the semantic, which
specifies the action taken by each entity when specific events occur.
Example: HTTP protocol for communication between web browsers
and servers.
Ethernet
A type of networking protocol—it defines the types of cables and connections that are used to wire computers, switches, and routers together. Most often Ethernet cabling is Category 5 or 6, made up of twisted pair wiring similar to phone cables.
Hub
A network device that repeats the traffic it receives to all connected devices.
Switch
A network device that sends traffic it receives to a specific connected device, such as a single desktop computer or laptop.
Router
A network device that can bridge between different networks, determine what traffic can pass between them, and perform other functions on a network, such as assigning IP addresses.
Firewall
A function typically performed by routers, this filters traffic between networks and can protect them from interference or attacks.
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