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ECE 3325 (EXAM 1) 1
| Question | Answer |
|---|---|
| "Another advantage of having international standards for network protocols is that widespread use of any standard will give it economies of scale, as with VLSI chips." | True |
| A disadvantage international standards for network protocols is that once a standard has been widely adopted, it is difficult to change, even if new and better techniques or methods are discovered. By the time it has been accepted, it may be obsolete. | True |
| "If the unit exchanged at the data link level is called a frame and the unit exchanged at the network level is called a packet, do frames encapsulate packets or do packets encapsulate frames?" | Frames encapsulate packets |
| Layers one, two, and three of the OSI Model are implemented in the end systems but not in the routers in the network core | False |
| One advantage of having international standards for network protocols is that if everyone uses the standard, everyone can talk to everyone. | True |
| One disadvantage of using international standards is that if everyone uses the standard, everyone can talk to everyone. | False |
| Wireless networks have surpassed wired networks in popularity, even though they typically provide less bandwidth. Select all the reasons listed below that are true and correct. (1) | Although wireless networks provide lower bandwidth than wired networks, their bandwidth has become large enough to support applications that people find meaningful. Wireless networks allow people to move around, instead of tying them to a wall. |
| Wireless networks have surpassed wired networks in popularity, even though they typically provide less bandwidth. Select all the reasons listed below that are true and correct. (2) | Installing wires in buildings can be expensive. A potential problem is battery life, since most wireless devices tend to be mobile. |
| Which of the following descriptions below correspond to a "nuts-and-bolts" view of the Internet? Select one or more of the answers below that are correct. | A collection of billions of computing devices, and packet switches interconnected by links. A "network of networks". |
| Which of the following descriptions below correspond to a "nuts-and-bolts" view of the Internet? Select one or more of the answers below that are correct. | A collection of hardware and software components executing protocols that define the format and the order of messages exchanged between two or more communicating entities (the actions taken on the transmission and/or receipt of a message or other event.) |
| Which of the following descriptions below correspond to a "services" view of the Internet? Select one or more of the answers below below that are correct below that are correct. | A place I go for information, entertainment, and to communicate with people. A platform for building network applications. |
| Which of the following human scenarios involve a protocol? Select one or more answers below that are correct. Hint: more than one of answers below are correct. | Two people introducing themselves to each other. One person asking, and getting, the time to/from another person. |
| Protocols define the format, order of messages sent and received among network entities, and actions taken on message transmission, receipt? | define the format, order of messages sent and received among network entities, and actions taken on message transmission, receipt? |
| Which of the following human scenarios involve a protocol? Select one or more answers below that are correct. Hint: more than one of answers below are correct. | A student raising her/his hand to ask a really insightful question, followed by the teaching acknowledging the student, listening carefully to the question, and responding with a clear, insightful answer. And then thanking the student for the question. |
| Which of the following physical layer technologies has the highest transmission rate and lowest bit error rate in practice? | Fiber optic cable |
| Choose one the following two definitions that makes the correct distinction between routing versus forwarding. | Forwarding is the local action of moving arriving packets from router’s input link to appropriate router output link, while routing is the global action of determining the source-destination paths taken by packets. |
| Which of the characteristics below are associated with the technique of packet switching? Select all correct answers. | Data may be queued before being transmitted due to other user’s data that’s also queueing for transmission. This technique is used in the Internet. |
| Which of the characteristics below are associated with the technique of packet switching? Select all correct answers. | Congestion loss and variable end-end delays are possible with this technique. Resources are used on demand, not reserved in advance. |
| When we say that the Internet is a “network of networks,” we mean? | The Internet is made up of a lot of different networks that are interconnected to each other. The Internet is made up of access networks at the edge, tier-1 networks at the core, and interconnected regional and content provider networks as well. |
| Consider a scenario in which 5 users are being multiplexed over a channel of 10 Mbps. Each user generates traffic at an average rate of 2.1 Mbps, generating traffic at a rate of 15 Mbps when transmitting | Neither works well in this overload scenario |
| Consider a scenario in which 5 users are being multiplexed over a channel of 10 Mbps. Each user generates traffic at an average rate of 2 Mbps, generating traffic at a rate of 2 Mbps when transmitting | Circuit switching |
| Consider a scenario in which 5 users are being multiplexed over a channel of 10 Mbps. Each user generates traffic at an average rate of 0.21 Mbps, generating traffic at a rate of 15 Mbps when transmitting | Packet switching |
| A network with three links each with transmission rate of 1 Mbps and a propagation delay of 1 msec per link. Length of packet is 1000 bits. What is the end-end delay of a packet from transmission on link 1 until it reaches the server at the end of link 3 | 6 msec |
| Time needed to perform an integrity check, lookup packet information in a local table and move the packet from an input link to an output link in a router. | Processing delay |
| Time spent waiting in packet buffers for link transmission. | Queueing delay |
| Time spent transmitting packets bits into the link. | Transmission delay |
| Time need for bits to physically propagate through the transmission medium from end one of a link to the other. | Propagation delay |
| A single source client sending to a server over two links of capacities R1=100 Mbps and R3=10 Mbps. What is the maximum achievable end-end throughput for the client-to-server pair, assuming that the client is trying to send at its maximum rate? (in Mbps) | 10 Mbps |
| Protocols that are part of a distributed network application. | Application Layer |
| Transfer of data between one process and another process (typically on different hosts). | Transport layer |
| Delivery of datagrams from a source host to a destination host (typically) | Network layer |
| Transfer of data between neighboring network devices. | Link layer |
| Transfer of a bit into and out of a transmission media. | Physical layer |
| Match the name of an Internet layer with unit of data that is exchanged among protocol entities at that layer, using the pulldown menu: Application Layer | Message |
| Match the name of an Internet layer with unit of data that is exchanged among protocol entities at that layer, using the pulldown menu: Transport Layer | Segment |
| Match the name of an Internet layer with unit of data that is exchanged among protocol entities at that layer, using the pulldown menu: Network Layer | Datagram |
| Match the name of an Internet layer with unit of data that is exchanged among protocol entities at that layer, using the pulldown menu: Link Layer | Frame |
| Match the name of an Internet layer with unit of data that is exchanged among protocol entities at that layer, using the pulldown menu: Physical Layer | Bit |
| Consider the figure below, showing a link-layer frame heading from a host to a router. There are three header fields shown. Match the name of a header with a header label shown in the figure. (H1) | Link Layer |
| Consider the figure below, showing a link-layer frame heading from a host to a router. There are three header fields shown. Match the name of a header with a header label shown in the figure. (H2) | Network Layer |
| Consider the figure below, showing a link-layer frame heading from a host to a router. There are three header fields shown. Match the name of a header with a header label shown in the figure. (H3) | Transport layer |
| Which of the definitions below describe what is meant by the term "encapsulation" | Taking data from the layer above, adding header fields appropriate for this layer, and then placing the data in the payload field of the “packet” for that layer. |
| A disadvantage international standards for network protocols is that the political compromises necessary to achieve standardization frequently lead to poor standards. | True |
| ADSL bandwidth is shared and Cable bandwidth is not shared. | False |
| Category 6 copper cable can be used for 10 Gbps Ethernet. | True |
| Consider an application that transmits data at a steady rate. when such an application starts, it will continue running for a long period of time. Would a packet-switched network or a circuit-switched network be more appropriate for this application? | circuit-switched |
| Application transmits data at steady rate. A packet-switched network is used and traffic in this network comes from applications as described above. Sum of the application data rates is less than capacities of each/every link. Congestion control needed? | No congestion control is needed. |
| Negotiation has to do with getting both sides to agree on some parameters or values to be used during the communication. | True |
| Suppose 20 connections traverse the same link of rate 1 Gbps. Suppose that the client access links all have rate 10 Mbps. Then the maximum throughput for each connection is 50 Mbps. | False |
| The data link layer is responsible for sending data into packets. | False |
| The network layer encapsulates frames into segments. | False |
| The transport layer is responsible for sending data in frames. | False |
| Twisted-pair copper wire is no longer present in computer networks. | False |
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DylanCanalesMane
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