Week 8 - asheesh8/NET-150-TECH-JOURNAL GitHub Wiki

Lab 8-1 PT 1

Q1 = What are PC0 capabilities? -- PC0s IP address is 192.168.30.3 + the Default Gateway is 192.168.30.1. SOO I was able to ping the default gateway successfully 4/4 replies 0% loss but I could not ping PC1 or any other PCs (2-5) because pings resulted in a message like "Destination host is not unreachable."

Q2 = Why do pings to other networks fail? -- So the router only knows about the networks they are straight direct connected to. Without routing entries put in and configured, R2 has no knowledge of how to forward the packets to the remote networks like 192.168.20.0 or 192.168.10.0 so it returned as destination host not reachable. Basically there was no path for the packets to travel past the local net.

Q3 = R3 ip route commands? -- #ip route 192.168.20.0 255.255.255.0 10.10.10.1
-- #ip route 192.168.30.0 255.255.255.0 10.10.10.1
-- #ip route 10.10.20.0 255.255.255.0 10.10.10.1

Q4 =

Q5 = The output showed R1's routing table..... Entries marked C (Connected) were networks directly attached to R1's interfaces like 10.10.10.0 and 10.10.20.0 through serial interfaces, and 192.168.20.0 via FastEthernet.

Entries marked S (Static) are the manually configured routes like 192.168.10.0 via 10.10.10.2 (R3) + 192.168.30.0 through 10.10.20.2 (R2). This table is essentially what R1 references to decide where to send forward packets.

Q6 = The R3s routing table shows two connected entries which were 10.10.10.0 via serial interface anddd 192.168.10.0 through FastEthernet... Which are directly attached networks to it. The three Static entries show the manually configured routes for 192.168.20.0, 192.168.30.0, + 10.10.20.0 through 10.10.10.1 (which is R1), since R1 is R3's only exit to rest of the network.

Q7 = Pretty sure with 25 network segments every router would need manually configured route to each subnet it can't reach. This seems like a lot of work, easy to mess up and if anything changes u have to go fix every router by hand... Dynamic routing protocols like OSPF solve this by letting routers auto share and update route info with others.