CS/IS 190 Homework #1
Instructions: Answer all questions and put the answers on the excel spreadsheet which is available on my web page. Note that some questions have multiple correct answers. Print out the answer sheet or email it to me before the due deadline. Be sure to put your name on the answer sheet.
Chapter 2
Network Models
1. How many layers does the OSI model contain?
A. 3
B. 5
C. 7
D. 9
2. Which of the following statements about the OSI is FALSE?
A. The OSI model encourages modular design in networking.
B. Each protocol needs to understand all of the protocols handling all the other layers.
C. The OSI model provides a common jargon to describe the function of any network protocol.
D. Each layer of the OSI model addresses an essential network task.
3. Which standards organization is named for the Greek word for “equal”?
A. OSI
B. ISO
C. Cisco
D. IEEE
4. In some networks, data moves over radio waves. These waves fall into which layer of the OSI model?
A. Application
B. Session
C. Presentation
D. Physical
5. Which layer of the OSI model is associated with moving data from one system to another by means such as cabling or radio waves?
A. Layer 1
B. Layer 2
C. Layer 3
D. Layer 4
6. How long is a MAC address?
A. 12 hexadecimal characters
B. 48 bytes
C. 6 pairs of binary digits
D. 32 bits
7. A MAC address is composed of which two parts?
A. the network address and the node address
B. the computer name and the node address
C. the Organizationally Unique Identifier and the device ID of the NIC
D. the IP address and the NICs serial number
8. A MAC address is also known as a(n) ______address.
A. physical
B. logical
C. IP
D. router
9. NICs send and receive binary data as pulses of all of the following EXCEPT ______.
A. electricity
B. radio waves
C. gamma rays
D. light
10. All NICs on the same network must use the same ______, or they will not be able to communicate with other NICs.
A. frame check sequence
B. MAC address
C. frame type
D. IP address
11. Select the one function below that a NIC does NOT perform.
A. It sends and receives binary data.
B. It provides an interface between the PC and the network.
C. It creates frames.
D. It verifies the data within each frame.
12. Frames in most networks hold at most ______.
A. 150 bytes of data
B. 1024 bytes of data
C. 1500 bytes of data
D. 48 bytes of data
13. How are incoming frames handled by a switch?
A. The frames are sent only to the NIC that has the destination MAC address.
B. The frames are received by every NIC, but only the NIC with the matching MAC address processes the frame.
C. Every NIC processes the frame when it receives it.
D. The NIC broadcasts the contents of the frame.
14. Where does the CRC originate in a network frame?
A. The sending NIC attaches it.
B. The receiving NIC attaches it.
C. The network operating system generates it and attaches it.
D. The network administrator attaches it
15. How does the receiving station on a network use the CRC to verify that it received accurate data?
A. It uses a new divisor to find a new remainder.
B. It uses the same divisor as the sending station to find the same remainder.
C. It uses the same divisor as the sending station to find a different remainder.
D. It adds its key to that of the sending station to find the total.
16. Which of the following is a broadcast MAC address?
A. 255.255.255.255
B. FF-FF-FF-FF-FF-FF
C. 256
D. 1000
17. Which layer of the OSI model adds source and destination MAC addresses to frames?
A. Network
B. Data Link
C. Transport
D. Presentation
18. Which of the following best describes Logical Link Control (LLC)?
A. It is a Layer 1 protocol.
B. It is a sublayer of the Data Link layer.
C. It remembers the NIC’s MAC address.
D. It controls open network sessions.
19. Which layer of the OSI model is the only layer divided into two sublayers?
A. Transport
B. Network
C. Data Link
D. Physical
20. Routers have which of the following capabilities?
A. They allow a MAC address to be assigned to each computer.
B. They allow an IP address to be assigned to each computer.
C. They allow network connections across data lines that don’t use Ethernet.
D. They allow a network administrator to configure hardware settings.
21. Which of the following statements best describes an IP address?
A. It is a unique identifier burned into the NIC when it is manufactured.
B. It is a unique dotted decimal number assigned to every network node.
C. It is a number shared by all computers on the same network.
D. It is a number assigned only to routers, identifying their priority ratings.
22. When it receives data from the upper layers, which layer of the OSI model assembles the data into smaller pieces called packets?
A. Data Link
B. Physical
C. Network
D. Transport
23. Which layer of the OSI model uses routers and IP addresses to ensure that packets arrive at the correct system?
A. Presentation
B. Application
C. Network
D. Data Link
24. What device do you need to split a large network into smaller ones?
A. NIC
B. bridge
C. router
D. MAC address
25. What is the unique numeric identifier assigned to each device at the Network layer of a TCP/IP network?
A. IP address
B. MAC address
C. router name
D. port number
26. Routers function at which layer of the OSI model?
A. Physical
B. Data Link
C. Network
D. Transport
27. Which layer of the OSI model manages connecting applications to applications?
A. Application
B. Session
C. Data Link
D. Transport
28. Which layer of the OSI model refers to the code built into operating systems that enables network-aware applications?
A. Application
B. Transport
C. Session
D. Presentation
29. Which of these statements best describes an Application Programming Interface?
A. It is the GUI interface that Windows uses to interact with the user.
B. It is the top layer of the OSI model of networking.
C. It provides programmers with a standard way to extend an application’s capabilities.
D. It is a protocol that allows Web browsers to request data from a Web server.
30. Routers function at which layer of the TCP/IP model?
A. Internet
B. Application
C. Link
D. Transport
31. Which layer of the TCP/IP model is mapped to the bottom two layers of the OSI model?
A. Link
B. Internet
C. Application
D. Transport
32. Which layer of the TCP/IP model performs IP addressing functions?
A. Transport
B. Link
C. Internet
D. Application
33. Which TCP/IP model layer uses connection-oriented protocols?
A. Internet
B. Application
C. Link
D. Transport
34. Which layer of the TCP/IP model is mapped to the top three layers of the OSI model?
A. Internet
B. Link
C. Transport
D. Application
35. For a network tech, one benefit of understanding the OSI seven-layer model and how traffic in an actual network works through the model is applying this knowledge to ______.
A. purchasing NICs
B. connecting PCs to the Internet
C. troubleshooting networks
D. securing a PC
END CHAPTER 2 QUESTIONS
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Chapter 3
Cabling and Topology
1. A ______topology uses a single cable that connects all of the computers in a line.
A. bus
B. ring
C. star
D. mesh
2. Which topology provides fault tolerance?
A. Bus
B. Ring
C. Star
D. Hub
3. Which network topology requires an intelligent device in the centerof the design?
A. Mesh
B. Ring
C. Star
D. Point-to-multipoint
4. Which term describes a practical application of a topology and other critical technologies that provides a method to get data from one computer to another on a network?
A. Hybrid technology
B. Network technology
C. Segmented topology
D. Bus topology
5. Which type of cable is described as a central conductor wire that is surrounded by insulating materials and placed inside a braided metal shield?
A. Unshielded twisted pair
B. Shielded twisted pair
C. Coaxial
D. Fiber-optic
6. What is the most common use of coaxial cable in networking today?
A. Connecting computers in a small network
B. Connecting two computers in a point-to-point connection
C. Connecting a cable modem to an Internet Service Provider (ISP)
D. Connecting devices in a multipoint topology design
7. What is the only important measure of coax cabling?
A. Radio Grade (RG) rating
B. Ohm rating
C. Length
D. Amps
8. Which term refers to a relative measure of the resistance (or more precisely, characteristic impedance) on a cable?
A. Category (CAT) rating
B. Number of twisted pairs
C. Ohm rating
D. Radio grade (RG) rating
9. What is the meaning of the term “capacitance”?
A. How much a cable can resist the flow of electricity
B. How long it takes a wire to get a full charge
C. How much bandwidth the cable can support
D. How much throughput the cable is capable of providing
10. Which cable type suffers from electromagnetic interference (EMI)?
A. Unshielded twisted pair (UTP)
B. Shielded twisted pair (STP)
C. Fiber-optic
D. Coaxial
11. What is the minimum category rating of UTP cabling you would need for a network that runs at 1000 Mbps?
A. CAT 1
B. CAT 2
C. CAT 5
D. CAT 5e
12. UTP category ratings are based on what criteria?
A. The highest frequency the cable can handle
B. The maximum length of the cable segments
C. The number of devices that can be used on a network
D. The lowest bandwidth the cable can handle
13. Which category (CAT) of UTP cabling is the fastest?
A. CAT 3
B. CAT 5
C. CAT 5e
D. CAT 6
14. Which category rating uses a bandwidth of 250 MHz to accommodate 10000 Mbps?
A. CAT 3
B. CAT 5
C. CAT 6
D. CAT 6a
15. What distance can a signal travel on a fiber-optic cable?
A. 500 meters
B. One kilometer
C. 1000 meters
D. Tens of kilometers
16. Which type of cable works best for long-distance transmissions?
A. Coaxial
B. Unshielded twisted pair (UTP)
C. Shielded twisted pair (STP)
D. Fiber-optic
17. Which connector is used for UTP cabling on a network?
A. RF-11
B. BNC
C. RS-232
D. RJ-45
18. Which type of cable is uses a two-number designator consisting of core and cladding measurements?
A. Coaxial
B. Unshielded twisted pair (UTP)
C. Shielded twisted pair (STP)
D. Fiber-optic
19. How many cable fibers are normally required by almost all network technologies that use fiber-optic cable?
A. One
B. Two
C. Three
D. Four
20. What type of fiber-optic cable uses lasers to send signals?
A. Single-mode fiber (SMF)
B. Multimode fiber (MMF)
C. CAT 6
D. Triplex Fiber (TF)
21. A ______cable that uses LEDs is known as multimode fiber (MMF)?
A. single-mode
B. category 6a (CAT 6a)
C. fiber-optic
D. 50 Ohm
22. Almost all multimode fiber cables transmit ______wavelengths.
A. 600-nm
B. 850-nm
C. 1310-nm
D. 1550-nm
23. In response to the demand for two-pair cabling, manufacturers often connect two fibers together like a lamp cord to create the popular ______fiber-optic cabling.
A. RG-8
B. duplex
C. modal
D. single-mode
24. Which connection type is limited to point-to-point topology and uses a 25-pin femaleDB type?
A. BNC
B. LC
C. Parallel
D. Serial
25. What cabling predates both networking and the personal computer?
A. Parallel
B. Twisted pair
C. Firewire
D. Serial
26. Which IEEE committee sets the standards for networking?
A. IEEE 802
B. IEEE 803
C. IEEE 805
D. IEEE 801.1
27. Which fire cable rating has no significant fire protection?
A. Cable with a riser rating
B. Cable with fiber rating
C. Cable with a plenum rating
D. Cable with a polyvinyl chloride (PVC) rating
28. To reduce fire hazards, most city ordinances require the use of ______cable for network installations.
A. parallel
B. plenum
C. riser
D. fiber
29. The space between the acoustical tile ceiling in an office building and the actual concrete ceiling above is called the ______.
A. plenum
B. riser
C. attic
D. crawl area
30. Which IEEE subcommittee sets the standards for Wireless LAN networks?
A. 802.2
B. 802.3
C. 802.5
D. 802.11
END CHAPTER 3 QUESTIONS
Chapter 4
Ethernet Basics
1. What was the original maximum data transfer rate of the first Ethernet developed by Xerox?
A. 3 Mbps
B. 10 Mbps
C. 16 Mbps
D. 56 Kbps
2. Which company was involved in the 1979 introduction of the DIX Ethernet standard?
A. Intel
B. Microsoft
C. Dell
D. IBM
3. What is a shared attribute of all members of the Ethernet family of networking technologies?
A. The physical bus topology
B. The type of cabling
C. The preamble size
D. The network access method
4. Which of the following is true of an Ethernet hub?
A. It works as an amplifier to boost signal strength.
B. It reduces the collisions on an Ethernet network.
C. It reads a signal coming in from one port and repeats the signal out to the other ports.
D. It sends the same signal back down the port that originally sent it.
5. Which statement is an accurate comparison between repeaters and bridges?
A. Repeaters and bridges both amplify the data and retransmit the frames to provide better fault tolerance.
B. A repeater is an intelligent device that examines the packets while a bridge merely links segments.
C. Repeaters retransmit all packets, while bridges examine the destination MAC address to determine which packets to forward onto the next segment.
D. While bridges link segments to make a larger network, repeaters help manage and reduce traffic.
6. Including the preamble, how many basic pieces of information does an Ethernet frame contain?
A. Four
B. Five
C. Six
D. Seven
7. Which of the following statements best describes the preamble of an Ethernet frame?
A. It contains the CRC.
B. It includes a 7-byte series of alternating ones and zeroes followed by a 1-byte Start Frame.
C. It contains the MAC address of the source and the destination.
D. It contains the IP address of the source and the destination and is used by routers to deliver the frame to the proper location.
8. What does it mean if a NIC runs in promiscuous mode?
A. It broadcasts all frames.
B. It replies to all frames.
C. It processes all frames.
D. It forwards all frames.
9. What information would be included in the data portion of an Ethernet frame on an IP network?
A. Padding information
B. The frame check sequence (FCS) number
C. The IP addresses of the sending and receiving systems
D. The length of the data being transmitted
10. What is the minimum size of an Ethernet frame?
A. 64 bytes
B. 1024 bytes
C. 256 bytes
D. 1500 bytes
11. When a collision occurs on a network relying on the CSMA/CD access method, what alerts the network interface cards (NICs)?
A. Multiple access
B. Cyclic redundancy check
C. Overlapping signals
D. Spanning Tree Protocol
12. What is an acceptable maximum collision rate on a properly running Ethernet network?
A. One percent
B. Ten percent
C. Five percent
D. 20 percent
13. What is the biggest differentiator among Ethernet hubs?
A. The size of the power supply
B. The types of connectors
C. The price
D. The number of ports
14. Which version of Ethernet was introduced in 1990?
A. 10BaseFL
B. CSMA/CD
C. 802.3
D. 10BaseT
15. How many pins does an RJ-45 connector have?
A. Two
B. Four
C. Six
D. Eight
16. How many wires does the 10BaseT specification require in the cabling used?
A. Four
B. Six
C. Eight
D. Ten
17. Which type of cabling does the 10BaseT standard specify?
A. Coaxial
B. Shielded Twisted Pair (STP)
C. Fiber-Optic
D. Unshielded Twisted Pair (UTP)
18. Which Ethernet cabling standard defines an Ethernet network that uses CAT 3 or better UTP cabling, operating at 10Mbps?
A. 10BaseFL
B. 10BaseT
C. 10Base2
D. 100BaseTX
19. What information is identified in a cabling specification such as 10BaseT?
A. The signal type
B. The maximum IP address size
C. The maximum number of hubs
D. The maximum number of routers
20. How many pairs of pins in an RJ-45 connector does a 10BaseT device actually use?
A. Two
B. Six
C. Four
D. Eight
21. What is the meaning of the “10” in 10BaseT?
A. 10 meters maximum distance
B. Cabling with 10 pairs
C. Cabling with 10 wires
D. Maximum speed of 10 Mbps
22. What is the purpose of a crimper?
A. To attach the RJ-45 connector to the NIC
B. To connect a RJ-45 connector to the cable
C. To connect a NIC to a hub
D. To install a NIC in a PC
23. Which standard specifies multimode cabling?
A. 10BaseFL
B. 10BaseT
C. CAT 5e
D. CAT 6
24. What is the maximum distance between a hub and a node on a 10BaseT network?
A. 5 meters
B. 50 meters
C. 100 meters
D. 500 meters
25. What is the maximum number of nodes that can be attached to a 10BaseT segment or hub?
A. 10
B. 16
C. 1000
D. 1024
26. What is the maximum speed at which 10BaseT Ethernet networks communicate?
A. 3 Mbps
B. 10 Mbps
C. 100 Mbps
D. 500 Mbps
27. What kind of cabling does the 10BaseFL standard specify?
A. Coaxial
B. Unshielded Twisted Pair (UTP)
C. Shielded Twisted Pair (STP)
D. Fiber-optic
28. What is an advantage of fiber-optic cabling over Unshielded Twisted Pair (UTP)?
A. The signals travel slower.
B. It is easier and cheaper to install than UTP.
C. It has a longer maximum distance.
D. It is susceptible to electrical interference.
29. What basis do bridges use to determine whether to forward traffic?
A. MAC addresses
B. Traffic conditions at the time
C. IP addresses
D. Nothing because bridges forward all traffic
30. An Ethernet network using an Ethernet switch minimizes or avoids which events?
A. Resends
B. Termination
C. Collisions
D. Frame checking
END CHAPTER 4 QUESTIONS
Chapter 5
Modern Ethernet
1. Which term refers to the 100-Mbps standards, even though there are now newer versions of Ethernet available?
A. Fast Ethernet
B. Gigabit Ethernet
C. Full-duplex Ethernet
D. Switched Ethernet
2. The specification for 100BaseTX (100BaseT) calls for UTP cabling using ______or better rated cabling.
A. CAT 1
B. CAT 2
C. CAT 3
D. CAT 5
3. When a multispeed, auto-sensing 100BaseT NIC connects to a 10BaseT Ethernet hub, at what speed will the NIC function?
A. 10 Mbps sending, 100 Mbps receiving
B. 10 Mbps sending and receiving
C. 100 Mbps sending, 10 Mbps receiving
D. 100 Mbps sending and receiving
4. What is the physical limit to the number of nodes in every version of Ethernet?
A. 48
B. 256
C. 1024
D. 2048
5. What general type of cabling is a technician most likely to use today when installing Ethernet cabling in areas with high electrical interference?
A. Shielded twisted pair (STP)
B. Coaxial
C. Fiber-optic
D. Twinaxial copper
6. What type of fiber-optic cabling and connectors does a 100BaseFX network use?
A. Multimode with ST or SC connectors
B. Multimode with various connectors
C. Twinaxial with twinaxial connectors
D. Single-mode with various connectors
7. If you have a 100BaseT switched Ethernet network, what is the theoretical maximum bandwidth using full-duplex NICs?
A. 10 Mbps
B. 200 Mbps
C. 100 Mbps
D. 1000 Mbps
8. The NIC and the attached ______determine full- or half-duplex during the auto-negotiation process.
A. repeater
B. amplifier
C. hub
D. switch
9. Which version of Gigabit Ethernet is published under the 802.3ab standard?
A. 1000BaseT
B. 1000BaseSX
C. 1000BaseCX