Question 1. 1. (TCO 1) Suppose that there is exactly one packet switch between a

Question

Question 1.1. (TCO 1) Suppose that there is exactly one packet switch between a sending host and a receiving host. The transmission rate (R1) between the sending host and the switch is 100 Mbps, and between the receiving host and the switch (R2), 1,000 Mbps. Also, assume that the switch uses store-and-forward packet switching. What is the end-to-end delay for a 1,500 Byte packet (length L)? (In this question, ignore queuing, propagation delay, and processing delay). (Points : 5)        16.5 µs
       165 µs
       13.2 µs
       132 µs
       none of the above Question 2.2. (TCO 1) Two hosts, A and B, are separated by 15,000 km and are connected by a 10-Mbps direct link. The propagation speed over the link is 2.5 * 108 m/s. If you are sending 10-million bits of information, what is the maximum number of bits that will be on the link at any given time?(Points : 5)        600 * 103 bits
       600 bits
       160 * 103 bits
       300 bits
       none of the above Question 3.3. (TCO 5) A CSMA/CD network suffers six collisions and chooses K=5. If the system is operating on a 10-Mbps link, what is the delay (in seconds) before it tries to transmit again? (Points : 5)        204.8 µs
       256 µs
       500 ns
       25.6 µs
       none of the above Question 4.4. (TCO 5) Consider a multiple-access protocol network with the following characteristics: There is a special-purpose frame that is exchanged among the nodes in a fixed order. What is this type of multiple-access network called? (Points : 5)        polling
       token
       carrier sense
       slotted aloha
       none of the above Question 5.5. (TCO 5) All local-area networks (LANs) provide ___________________ services. (Points : 5)        connection-oriented
       good-quality
       connectionless
       both a and c
       none of the above Question 6.6. (TCO 5) Ignoring restricted addresses, what is the maximum number of IPv6 addresses supported by a system? (Points : 5)        248
       2116
       256
       2124
       none of the above Question 7.7. (TCO 5) Multipurpose Label-Switching (MPLS) routers use _________________ to forward their packets. (Points : 5)        IP addresses
       MAC addresses
       fixed-length labels
       Port addresses
       none of the above Question 8.8. (TCO 4) Which of the following method(s) is/are used to support switching in a router? (Points : 5)        memory
       star
       interconnect
       a and c only
       all of the above Question 9.9. (TCO 4) Suppose that there are five routers between a source host and a destination host. If a 1,400-byte message (i.e., there is no fragmentation) is sent from the source host to the destination host, how many interfaces are involved? (Points : 5)        8
       9
       10
       12
       none of the above Question 10.10. (TCO 4) What is a difference between an IP-switched network and an ATM-switched network? (Points : 5)        IP has virtual-circuit path for datagram flow
       IP is a packet-switched network, while ATM is not
       ATM routing is a self-routing process and this is not the case in IP
       all of the above
       none of the above (i.e., there is no difference between the two networks) Question 11.11. (TCO 4) What is the difference between an IPv4-supported network and an IPv6-supported network? (Points : 5)        Header checksum
       Fragmentation
       Header options
       Header length
       all of the above Question 1.1. (TCO 1) Suppose that there is exactly one packet switch between a sending host and a receiving host. The transmission rate (R1) between the sending host and the switch is 100 Mbps, and between the receiving host and the switch (R2), 1,000 Mbps. Also, assume that the switch uses store-and-forward packet switching. What is the end-to-end delay for a 1,500 Byte packet (length L)? (In this question, ignore queuing, propagation delay, and processing delay). (Points : 5)        16.5 µs
       165 µs
       13.2 µs
       132 µs
       none of the above Question 2.2. (TCO 1) Two hosts, A and B, are separated by 15,000 km and are connected by a 10-Mbps direct link. The propagation speed over the link is 2.5 * 108 m/s. If you are sending 10-million bits of information, what is the maximum number of bits that will be on the link at any given time?(Points : 5)        600 * 103 bits
       600 bits
       160 * 103 bits
       300 bits
       none of the above Question 3.3. (TCO 5) A CSMA/CD network suffers six collisions and chooses K=5. If the system is operating on a 10-Mbps link, what is the delay (in seconds) before it tries to transmit again? (Points : 5)        204.8 µs
       256 µs
       500 ns
       25.6 µs
       none of the above Question 4.4. (TCO 5) Consider a multiple-access protocol network with the following characteristics: There is a special-purpose frame that is exchanged among the nodes in a fixed order. What is this type of multiple-access network called? (Points : 5)        polling
       token
       carrier sense
       slotted aloha
       none of the above Question 5.5. (TCO 5) All local-area networks (LANs) provide ___________________ services. (Points : 5)        connection-oriented
       good-quality
       connectionless
       both a and c
       none of the above Question 6.6. (TCO 5) Ignoring restricted addresses, what is the maximum number of IPv6 addresses supported by a system? (Points : 5)        248
       2116
       256
       2124
       none of the above Question 7.7. (TCO 5) Multipurpose Label-Switching (MPLS) routers use _________________ to forward their packets. (Points : 5)        IP addresses
       MAC addresses
       fixed-length labels
       Port addresses
       none of the above Question 8.8. (TCO 4) Which of the following method(s) is/are used to support switching in a router? (Points : 5)        memory
       star
       interconnect
       a and c only
       all of the above Question 9.9. (TCO 4) Suppose that there are five routers between a source host and a destination host. If a 1,400-byte message (i.e., there is no fragmentation) is sent from the source host to the destination host, how many interfaces are involved? (Points : 5)        8
       9
       10
       12
       none of the above Question 10.10. (TCO 4) What is a difference between an IP-switched network and an ATM-switched network? (Points : 5)        IP has virtual-circuit path for datagram flow
       IP is a packet-switched network, while ATM is not
       ATM routing is a self-routing process and this is not the case in IP
       all of the above
       none of the above (i.e., there is no difference between the two networks) Question 11.11. (TCO 4) What is the difference between an IPv4-supported network and an IPv6-supported network? (Points : 5)        Header checksum
       Fragmentation
       Header options
       Header length
       all of the above

Explanation / Answer

Question 1.1: End to end delay = L/R1 + L/R2 = 1500/100 Mbps +1500/1000Mbps = 16.5  µs

Answer: a) 16.5 µs

Question 7.7 : a) IP addresses

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