2.  WAN uses Serial ports  Ethernet Ports:  Straight through  Cross over

3. Configuring a Serial interface  interface configuration mode  ip address and subnet mask  no shutdown Example: R1(config)#interface serial 0/0 R1(config-if)# ip address 172.16.2.1 255.255.255.0 R1(config-if)#no shutdown

4. Examining Router Interfaces Physically connecting a WAN Interface  A WAN Physical Layer connection has sides:  Data Circuit-terminating Equipment (DCE)  Data Terminal Equipment (DTE) Configuring serial links  One side of a serial connection must be considered a DCE.  Serial Interfaces require a clock signal to control the timing of the communications, by placing a clocking signal use clock rate Example: R1(config)# interface serial 0/0 R1(config-if)# clock rate 64000

5. Routing Table is stored in RAM and contains information about:  Directly connected networks - this occurs when a device is connected to a router’s interface  Remotely connected networks - this is a network that is not directly connected to a particular router  Detailed information about the networks include source of information, network address & subnet mask, and Ip address of next-hop router show ip route command is used to view a routing table

6. Includes:  Network address  Subnet mask  IP address of next hop router or exit interface  Denoted with the code S in the routing table ip route 172.16.1.0 255.255.255.0 172.16.2.2  ip route - Static route command  172.16.1.0 – Destination network address  255.255.255.0 – Subnet mask of destination network  172.16.2.2 - Serial 0/0/0 interface IP address on R2, which is the "next-hop" to this network

7. Route summarization  Combining a number of static routes into a single static route.  Summarizing routes reduces the size of the routing table.

8. Configuring a summary route Step 1: Delete the current static route Step 2: Configure the summary static route Step 3: Verify the new static route

9. Default Static Route  This is a route that will match all packets.  Stub routers that have a number of static routes all exiting the same interface are good candidates for a default route  Like route summarization this will reduce the size of the routing table

10. Configuring a default static route  Similar to configuring a static route.  Only one default static router per router  Except that destination IP address and subnet mask are all zeros. Example: Router(config)# ip route 0.0.0.0 0.0.0.0 [exit-interface | ip-address ]

12.  Build the network topology.  Basic router configurations.  Hostname  Enable secret password  Logging synchronous command ( Console and Virtual terminal lines)  Interpret Debug output: shows when routes are added, deleted or modified from routing table.  Configure LAN and WAN interfaces of router R1.  Configure WAN link on R2 and R3 using console connection.(turn on debug)  Turn off debugging on both routers R1 and R2.  Check the routing tables on routers.  Configure IP addresses on Host PCs.

13.  Verify the configuration: from PCs to their Gateways.  Verify the configuration: between routers.  Check connectivity between devices on different networks.  Configure the Static route using next hop  Configure the Static route using exit interface.  Configure Default Static route.  Configure Summary Static route