Vault sync: 2021-11-06 14:52:11

School/Analyse/Layers/3. Network Layer.md

@@ -50,3 +50,32 @@ Network ID is marked as bold.
 - Address:
 			**195.210**.23.14
 			
+## Router
+Router is a member of multiple networks.
+
+![[routers-example.png]]
+
+For each connection to a network a routers uses a network interface card (NIC) and a IP address.
+
+This way a router can have multiple IP addresses.
+
+Each connection is identified by a interface, label or an address.
+
+Example of a routing table:
+![[routing-table.png]]
+
+### Updating router tables
+Routers are responsible for updating routing tables themselves.
+
+When a router detects a change in connections, it immediately informs other routers about it.
+
+Routers use optimum route finding algorithms to update their tables.
+
+Exchanging routing information between routers is done periodically even when there is no change in the network.
+
+The most commonly used routing algorithms are:
+- Distance vector routing (RIP)
+- Link-state Routing (OSPF, IS-IS)
+
+## Addressing problem
+