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 1,000 Mbps, and between the receiving host and the switch (R2), 100 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)
2. (TCO 1) Two hosts, A and B, are separated by 10,000 km and are connected by a 100-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?
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?
4. (TCO 5) Consider a multiple-access protocol network with the following characteristics: The host listens to the transmission line before it transmits its information. What is this type of multiple-access network called?
5. (TCO 5) A(n) ____________ address is used by the Logical Link Control (LLC) layer to denote a specific mechanism, process, or upper-layer protocol requesting services from the LLC sub-layer.
6. (TCO 5) Ignoring restricted addresses, what is the maximum number of MAC addresses supported by a system?
7. (TCO 5) If used, _________________ protocols are located between the data-link layer protocol and the network-layer protocol
8. (TCO 4) Which of the following method(s) is/are used to support switching in a router?
9. (TCO 4) Suppose that there are four 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 forwarding tables are indexed?
10. (TCO 4) What is a difference between an IP-switched network and an ATM-switched network?
11. (TCO 4) What is the difference between an IPv4-supported network and an IPv6-supported network?
1. (TCO 4) Suppose that datagrams are limited to 1,500 bytes (including headers) between Source-Host A and Destination-Host B. Assume that you have a 40-byte IP header and a 20-byte TCP header. How many datagrams would be required to send an MP3 message consisting of 32-million bits?
2. (TCO 4) The Distance-Vector routing algorithm is _____________________.
3. (TCO 4) A(n) ___________________________ is a group of routers that run the same routing algorithm within its group
4. (TCO 4) The ________________ interior gateway protocol periodically sends routing information to just its neighboring routers
5. (TCO 4) Consider the network shown below. Suppose that Network 1 and Network 3 are running OSPF, and Network 2 and Network 4 are running RIP. Suppose that eBGP and iBGP are used for the inter-network routing protocol. There is no link between Networks 2 and 3. From which protocol does Router 3c learn about prefix x?
6. (TCO 3) A router-connectivity device will separate the following two domains
7. (TCO 3) Which Transport-Layer protocol provides connection-oriented service?
8. (TCO 3) When a TCP segment is received and found to be corrupted, it is __________________.
9. (TCO 3) Suppose that two TCP connections are present over some bottleneck link of Rate-10 Mbps. Both connections have files to send over the bottleneck link. Host-1 transmission rate would be___________, while Host 2 transmission rate would be ______________.
10. (TCO 3) Consider transferring an enormous file that uses all of the sequence numbers that are available from Host A to Host B. Use a MSS of 1,400 Bytes with 100 Bytes of header in each datagram. The link is 1,000 Mbps. With continuous transmission and ignoring flow control and congestion control, how long does it take to send the data?
11. (TCO 3) TCP uses __________________ as a congestion-control mechanism
1. (TCO 1) Within a network, _______________ define the exchange of messages and the actions taken when these messages are sent and received
2. (TCO 1) The Internet, for all intents and purposes, is a _______________ switched network
3. (TCO 4) Based on the information shown in the figure, complete the Link-State routing table.
Link-State Routing Figure
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 1,000 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).
2. (TCO 1) Two hosts, A and B, are separated by 10,000 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?
3. (TCO 5) A CSMA/CD network suffers six collisions and chooses K=5. If the system is operating on a 100-Mbps link, what is the delay (in seconds) before it tries to transmit again?
4. (TCO 5) Consider a multiple-access protocol network with the following characteristics: There is a master host that checks with each of the other nodes to see if they have traffic to send. What is this type of multiple-access network called?
5. (TCO 5) A(n) ____________ address is used by the Logical Link Control (LLC) layer to denote a specific mechanism, process, or upper-layer protocol requesting services from the LLC sub-layer.
6. (TCO 5) Ignoring restricted addresses, what is the maximum number of IPv4 addresses supported by a system?
7. (TCO 5) Multipurpose Label-Switching (MPLS) routers use _________________ to forward their packets
8. (TCO 4) Which of the following method(s) is/are used to support switching in a router?
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?
10. (TCO 4) What is a difference between an IP-switched network and an ATM-switched network?
11. (TCO 4) What is the difference between an IPv4-supported network and an IPv6-supported network?
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1. (TCO 4) Suppose that datagrams are limited to 1,500 bytes (including headers) between Source-Host A and Destination-Host B. Assume that you have a 20-byte IP header and a 20-byte TCP header. How many datagrams would be required to send an MP3 message consisting of 16-million bits?
2. (TCO 4) The Distance-Vector routing algorithm is
3. (TCO 4) A(n) ___________________________ is a group of routers that are typically under the same administrative control.
4. (TCO 4) The ________________ interior gateway protocol uses a Link-State routing algorithm based on Dijkstra
5. (TCO 4) Consider the network shown below. Suppose that Network 1 and Network 3 are running OSPF, and Network 2 and Network 4 are running RIP. Suppose that eBGP and iBGP are used for the inter-network routing protocol. There is no link between Networks 2 and 3. From which protocol does Router 3c learn about prefix x?
6. (TCO 3) A bridge connectivity device will separate the following two domains
7. (TCO 3) Which Transport-Layer protocol provides connectionless service?
8. (TCO 3) Duplicate datagrams in a TCP exchange are _________________ and ________________.
9. (TCO 3) Suppose that two TCP connections are present over some bottleneck link of Rate-10 Mbps. Both connections have files to send over the bottleneck link. Host-1 transmission rate would be___________, while Host 2 transmission rate would be ______________.
10. (TCO 3) Consider transferring an enormous file that uses all of the sequence numbers available from Host A to Host B. Use a MSS of 1,400 Bytes with 100 Bytes of header in each datagram. The link is 10 Mbps. With continuous transmission and ignoring flow control and congestion control, how long does it take to send the data?
11. (TCO 3) TCP uses __________________ as a congestion-control mechanism
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1. (TCO 1) Within a network, _______________ define the exchange of messages and the actions taken when these messages are sent and received.
2. (TCO 1) In a _______________ switched network, the resources on the transmission path are reserved for the duration of a communication
3. (TCO 4) Based on the information shown in the figure, complete the Link-State routing table
1. (TCO 1) Given the following information, find the total delay:
propagation velocity = 2.5 * 108
distance = 1000 km
Three routers in the path, each with a 1 ms processing delay
Congestion delay due to queuing = 2.4 ms
Transmission delay is negligible (Points : 5)
propagation velocity = 2.5 * 108
distance = 1000 km
Three routers in the path, each with a 1 ms processing delay
Congestion delay due to queuing = 2.4 ms
Transmission delay is negligible (Points : 5)
2. (TCO 1) As the traffic intensity approaches 1, the average queue length gets _______________. (Points : 5)
3. (TCO 1) Suppose that a message is segmented into 3000 packets, with each packet being 1000 bytes. Suppose 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 10 Mbps, and between the receiving host and the switch (R2) it is 10 Mbps. Also assume that the switch uses store and forward packet switching and when the first packet is being sent from the switch to the receiving host, the second packet is being sent from the sending host to the switch. What is the end-to-end delay to send all packets? (In this question, ignore queuing, propagation delay, and processing delay.) (Points : 5)
4. 4. (TCO 1) Suppose users share a 4 Mbps link. Also suppose each user transmits continuously at 2 Mbps when transmitting, but each user transmits only 30% of the time. When packet switching is used, and there are three users transmitting simultaneously, what is the fraction of time that the queue grows? (Points : 5)
5. (TCO 5) Which of the following actions are included in a data link layer protocol when sending and receiving datagrams? (Points : 5)
6. (TCO 5) Which of the following is a data link layer protocols? (Points : 5)
7. (TCO 5) __________________ is the switch function that determines the interfaces to which a frame should be directed. (Points : 5)
8. (TCO 5) A data link layer protocol that operates over a link directly connecting two nodes (one at each end of the link) is called a(n) ________________ protocol. (Points : 5)
9. (TCO 4) When a LAN is using a local IPv4 address, its local IPv4 address must be converted to a global IPv4 address in a Gateway. A _______________ is used for this purpose. (Points : 5)
10. (TCO 4) Consider the network shown below. Suppose Network 1 and Network 3 are running OSPF and Network 2 and Network 4 are running RIP. Suppose eBGP and iBGP are used for the inter-network routing protocol. There is no link between Networks 2 and 3. From which protocol does Router 2a learn about prefix x?
11. (TCO 3) A TCP origination request is identified by a(n) ________________ in the TCP header. (Points : 5)
12. (TCO 3) Using the simplified macroscopic model for the steady-state behavior of TCP, what is the average throughput of a connection with a window size of 128,000 bytes and a round trip time of 10 ms? (Points : 5)
13. (TCO 3) TCP Reno uses ______________ for TCP congestion control. (Points : 5)
14. (TCO 2) Which of the following application protocols is encapsulated inside a UDP protocol? (Points : 5)
15. (TCO 2) Which of the following transport services is provided to applications transferring data using UDP or TCP? (Points : 5)
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1. (TCO 2) The _____________ connection(s) remains connected during an entire FTP process whereas ____________ connection(s) is/are opened and closed with each file transfer. (Points : 5)
2. (TCO 2) TFTP typically uses the ______________ transport protocol. (Points : 5)
3. (TCO 2) DNS servers used in the Internet are designed to exist in a __________________ architecture. (Points : 5)
4. (TCO 6) The Stream Control Transmission Protocol (SCTP) uses ____________________ to keep track of users. (Points : 5)
5. (TCO 6) When clients request on-demand compressed audio or video files that are stored on servers, this class of applications has the following key distinguishing feature(s). (Points : 5)
6. (TCO 6) The Real-Time Streaming Protocol (RTSP) allows a host to _______________. (Points : 5)
7. (TCO 6) Suppose Alice, Jane, Fred, and Bob want to have an audio conference call using SIP and RTP. For Alice to send and receive RTP packets to and from Jane, Fred, and Bob, how many UDP sockets does Alice require? (Points : 5)
8. (TCO 6) Consider an RTP session consisting of five users, all of whom are sending and receiving RTP packets into the same multicast address. Each user sends video at 200 kbps. What will be the allocated RTCP bandwidth for a particular receiver? (Points : 5)
9. (TCO 7) In a code division multiplex access (CDMA) system, what does the correlation function equal if the two codes have nothing in common? (Points : 5)
10. (TCO 7) The wireless channel impairment due to the electromagnetic waves of another source operating at the same frequency is called ________________. (Points : 5)
11. (TCO 7) To avoid collisions with hidden terminals, 802.11 MAC wireless stations can use _______________. (Points : 5)
12. (TCO 7) What is the maximum number of simultaneous active slaves supported by a Bluetooth network? (Points : 5)
13. (TCO 7) The WiMAX 802.16 architecture with its clients and base station resembles a(n) ______________. (Points : 5)
14. (TCO 7) What factors can impact performance at the TCP protocol layer of a wireless network? (Points : 5)
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1. (TCO 4) Based on the information shown in the figure, complete the Link-State routing table.
2. (TCO 4) Based on the figure shown, fill in the tables for the first iteration and the final iteration for Node “b” using the Bellman-Ford routing algorithm
3. (TCO 6) Using the figure provided, compute the estimated delay and the estimated deviation of the delay from the estimated average with u = 0.15 for the packets identified in the table.
4. (TCO 6,8) Who created H.323? Explain its purpose. (Points : 15)
5. (TCO 3) At what layer does end-to-end congestion control operate? Explain how it works. (Points : 15)
6. (TCO 2) Look at the captured Wireshark string of ASCII characters for an HTTP GET message. Looking at the provided text, determine which browser is being used for this request
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