A 143.24.56.1 B You are given the following internetworking scenario: 143.24.56.254 Ethernet 132.14.73.1 Ethernet Router 1...

    

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A 143.24.56.1 B You are given the following internetworking scenario: 143.24.56.254 Ethernet 132.14.73.1 Ethernet Router 1 Network - Subnetwork 132.14.0.0 143.24.56.0 155.23.76.0 155.23.77.0 155.23.77.253 Router 2 c b Router 1 155.23.77.254 b local local local 155.23.76.12 Ethernet 132.14.73.156 Router Address The above IP network has just come on-line (i.e. all devices have just powered up). The routers contain the following decision tables: 155.23.76.253 155.23.76.25 Network Mask 255.255.0.0 255.255.255.0 255.255.255.0 255.255.255.0 Token Ring Bridge Token Ring a b Interface Network - Subnetwork 143.24.0.0 155.23.76.0 155.23.77.0 132.14.73.0 Router 2 Router Address 155.23.77.254 local local local Network Mask 255.255.0.0 255.255.255.0 255.255.255.0 255.255.255.0 Interface b a (a) List the actions and routing decisions taken by all stations and routers to route an IP datagram containing an ICMP Echo Request transmitted by Station A to Station B. (b) List the actions and routing decisions taken by all stations and routers to route an IP datagram containing an ICMP Echo Reply returned by Station B to Station A. A 143.24.56.1 B You are given the following internetworking scenario: 143.24.56.254 Ethernet 132.14.73.1 Ethernet Router 1 Network - Subnetwork 132.14.0.0 143.24.56.0 155.23.76.0 155.23.77.0 155.23.77.253 Router 2 c b Router 1 155.23.77.254 b local local local 155.23.76.12 Ethernet 132.14.73.156 Router Address The above IP network has just come on-line (i.e. all devices have just powered up). The routers contain the following decision tables: 155.23.76.253 155.23.76.25 Network Mask 255.255.0.0 255.255.255.0 255.255.255.0 255.255.255.0 Token Ring Bridge Token Ring a b Interface Network - Subnetwork 143.24.0.0 155.23.76.0 155.23.77.0 132.14.73.0 Router 2 Router Address 155.23.77.254 local local local Network Mask 255.255.0.0 255.255.255.0 255.255.255.0 255.255.255.0 Interface b a (a) List the actions and routing decisions taken by all stations and routers to route an IP datagram containing an ICMP Echo Request transmitted by Station A to Station B. (b) List the actions and routing decisions taken by all stations and routers to route an IP datagram containing an ICMP Echo Reply returned by Station B to Station A.