CPE 348 Exam #1 (50 + 3 pts) October 07, 2019 4) (12 pts) Consider the following virtual circuit network and the table showing the next Virtual Circuit Identifier (VCI) to use for each interface. The outgoing and incoming VCI's can be the same for a given interface/port (ie, interface 3 on switch 1 can have a VCI of 5 for incoming packets and a VCI of 5 for outgoing packets). An interface is the same as port, and only the interfaces of interest for each switch are shown (ie, interfaces 1 and 2 on switch 2). Note: the network does not show all of the interfaces available on all switches, and it does not show all of the other nodes in the network. Lastly, each interface has its own set of virtual circuit identifiers (.e each interface on a switch has its own VCI's 0, 1, 2, etc.) The next VCI to use for interfaces on the switches Switch Incoming Interface Next VCI to Use 0 0 33 1 2 20 12 Host A starts a connection to Host Z by sending a setup message. A short while later (after connection from A to Z has been established). Host Z starts a connection with Host A by sending a setup message. Use the table above to complete the switch tables below to show the new entries created during these virtual circuit setups. Assume that all previous connections remain active during the setups. Use a next VCI of 3 for Host A (as the receiver) and a next VCI of 6 for Host z (as the receiver). Virtual Circuit Table for Switch 1 (S1) Incoming Interface Incoming VCI Outgoing Interface Outgoing VCI creating entry A to Z Z to A Virtual Circuit Table for Switch 2 (S2) Incoming Interface Incoming VCI Outgoing Interface Outgoing VCI creating entry A to Z Z to A Virtual Circuit Table for Switch 3 (53) Setup message age Incoming Interface Incoming VCI Outgoing Interface Outgoing VCI creating entry A to Z Z to A Page 5 of 7 CPE 348 Exam #1 (50 + 3 pts) October 07, 2019 4) (12 pts) Consider the following virtual circuit network and the table showing the next Virtual Circuit Identifier (VCI) to use for each interface. The outgoing and incoming VCI's can be the same for a given interface/port (ie, interface 3 on switch 1 can have a VCI of 5 for incoming packets and a VCI of 5 for outgoing packets). An interface is the same as port, and only the interfaces of interest for each switch are shown (ie, interfaces 1 and 2 on switch 2). Note: the network does not show all of the interfaces available on all switches, and it does not show all of the other nodes in the network. Lastly, each interface has its own set of virtual circuit identifiers (.e each interface on a switch has its own VCI's 0, 1, 2, etc.) The next VCI to use for interfaces on the switches Switch Incoming Interface Next VCI to Use 0 0 33 1 2 20 12 Host A starts a connection to Host Z by sending a setup message. A short while later (after connection from A to Z has been established). Host Z starts a connection with Host A by sending a setup message. Use the table above to complete the switch tables below to show the new entries created during these virtual circuit setups. Assume that all previous connections remain active during the setups. Use a next VCI of 3 for Host A (as the receiver) and a next VCI of 6 for Host z (as the receiver). Virtual Circuit Table for Switch 1 (S1) Incoming Interface Incoming VCI Outgoing Interface Outgoing VCI creating entry A to Z Z to A Virtual Circuit Table for Switch 2 (S2) Incoming Interface Incoming VCI Outgoing Interface Outgoing VCI creating entry A to Z Z to A Virtual Circuit Table for Switch 3 (53) Setup message age Incoming Interface Incoming VCI Outgoing Interface Outgoing VCI creating entry A to Z Z to A Page 5 of 7
