CS450 - Computer Networking Exercises 04
Match each type of frame field to its function. (Not all options are used.) addressing (a) error detection (b) type (c) start frame delimiter (d) (1) The field identifies the beginning of the frame (2) The field identifies special flow control services (3) The field checks if the frame has been damaged during the transfer (4) The field helps to direct the frame toward its destination (5) The field is used by the LLC to identified the layer 3 protocol
A -> 4 B -> 3 C -> 5 D -> 1
Match the description with the media. (Not all options are used.) STP (a) wireless (b) Optical fiber (c) coaxial (d) (1) The type of media is used for high transmission speed and can also transfer data over long distance (2) The type of media is used in wired office environment (3) The type of media provides the most mobility options (4) Traditionally used for television but can now be used in a network to connect the customer location to the wiring of the customer premises (5) This type of copper media is used in industrial or similar environments where there is a lot of interference
A -> 5 B -> 3 C -> 1 D -> 4
An employee wants to access the network of the organization remotely, in the safest possible way. What network feature would allow an employee to gain secure remote access to a company network? a) ACL b) IPS c) VPN d) BYOD
C) VPN Virtual private networks are used to provide secure access to remote workers.
Refer to the exhibit. Match the example networks to the type of network. (Not all options are used.) Network A (a) Network B (b) Network C (c) Network D (d) (1) SAN (2) LAN (3) WLAN (4) MAN (5) WAN
Network A (4) MAN - It consists of a number of different types of facilities that are connected within the same geographic area Network B (2) LAN - It is located in a limited geographic area in a single building Network C (3) WLAN - It is a LAN in which the devices are connected wirelessly. Network D (5) WAN - It is two geographically separate LANs that are connected to the same enterprise.
Which statement describes a characteristic of a converged network? A) A single network that delivers voice, video, and data to a variety of devices b) The network establishes separate communication channels for each network service c) The network uses different technologies for voice, video, and data d) Network services are delivered over a wide range of network platforms
A) A single network that delivers voice, video, and data to a variety of devices
Refer to the exhibit. What is the maximum possible throughput between the PC and the server? a) 128 kbps b) 10 Mbps c) 100 Mbps d) 1000 Mbps e) 1 Gbps
a) 128 kbps
a) The ______________ project started the development of inter-network connections using TCP/IP that has evolved into the Internet today. b) A __________ network is able to expand to accept new devices and applications without affecting performance. c) The farther you are from the central office when utilizing a DSL connection, the ________ the connection speed. d) An _________ is a private connection of LANs and WANs that belongs to an organization, and is designed to be accessible only by the members and employees of the organization, or others with authorization. e) ___________ allows the end user to use personal tools to communicate across business or campus networks f) In fiber optic media, the signals are represented as patterns of ____________
a) Arpanet b) scaleable c) slower d) intranet e)BYOD f) light
Which three acronyms/initialisms represent standards organizations? (Choose three.) a) IANA b) TCP/IP c) IEEE d) IETF e) OSI f) MA
a) IANA c) IEEE d) IETF
Which method of data transfer allows information to be sent and received at the same time? a) full-duplex b) half-duplex c) multiplex d) simplex
a) full-duplex
What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.) a) greater distances per cable run b) lower installation cost c) limited susceptibility to EMI/RFI d) durable connections e) greater bandwidth potential f) easily terminated
a) greater distances per cable run c) limited susceptibility to EMI/RFI e) greater bandwidth potential
Match the Internet connectivity type to the appropriate description or characteristic. (Not all options are used.) Metro Ethernet (a) Satellite (b) SDSL (c) Cable (d) Cellular (e) (1) Signal carried on the same copper or fiber medium as the television signal (2) Access via the cell phone network (3) Require a dish and clear line of sight for service (4) High-speed business class copper or fiber connection (5) Business class service that provides the same upload and download speed over telephone lines (6) Typically has very low bandwidth
a. Metro Ethernet - (4) High-speed business class copper or fiber connection b. Satellite - (3) Require a dish and clear line of sight for service c. SDSL - (5) Business class service that provides the same upload and download speed over telephone lines d. Cable - (1)Signal carried on the same copper or fiber medium as the television signal e. Cellular - (2) Access via the cell phone network
If the default gateway is configured incorrectly on the host, what is the impact on communications? a) The host is unable to communicate on the local network b) The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks c) The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network d) There is no impact on communications e) The host cannot communicate at all, neither with other hosts on the local network, nor with hosts on remote networks. f) The MAC address of a PC does not change when the PC is moved to a different network because the MAC address is embedded in the _____________ of the PC g) In fiber optic media, the signals are represented as patterns of ____________.
b) The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks
Question 12: In which scenario would the use of a WISP (Wireless Internet Service Provider) be recommended? a) an Internet cafe in a city b) a farm in a rural area without wired broadband access c) any home with multiple wireless devices d) an apartment in a building with cable access to the Internet
b) a farm in a rural area without wired broadband access Wireless Internet Service Providers (WISPs) are typically found in rural areas where DSL or cable access is not available. A dish or antenna on the property of the subscriber connects wirelessly to a WISP transmitter, eliminating the need for physical cabling outside the building.
What is a WAN? a) a network infrastructure designed to provide data storage, retrieval, and replication b) a network infrastructure that provides access to other networks over a large geographic area c) a network infrastructure that spans a limited physical area such as a city d) a network infrastructure that provides access in a small geographic area
b) a network infrastructure that provides access to other networks over a large geographic area
At which layer of the OSI model would a physical address be encapsulated? a) physical layer b) data-link layer c) network layer d) transport layer
b) data-link layer
Which logical address is used for delivery of data to a remote network? a) destination MAC address b) destination IP address c) destination port number d) source MAC address e) source IP address
b) destination IP address
A network team is comparing topologies for connecting on a shared media. Which physical topology is an example of a hybrid topology for a LAN? a) bus b) extended star c) ring d) partial mesh
b) extended star
What are two characteristics of a scalable network? (Choose two.) a) easily overloaded with increased traffic b) grows in size without impacting existing users c) is not as reliable as a small network d) suitable for modular devices that allow for expansion e) offers limited number of applications
b) grows in size without impacting existing users and d) suitable for modular devices that allow for expansion Scalable networks are networks that can grow without requiring costly replacement of existing network devices. One way to make a network scalable is to buy networking devices that are modular
What three requirements are defined by the protocols used in network communcations to allow message transmission across a network? (Choose three.) a) connector specifications b) message encoding c) media selection d) message size e) delivery options f) end-device installation
b) message encoding d) message size e) delivery options
What is the purpose of the OSI physical layer? a) controlling access to media b) transmitting bits across the local media c) performing error detection on received frames d) exchanging frames between nodes over physical network media
b) transmitting bits across the local media
What method is used to manage contention-based access on a wireless network? a) CSMA/CD b) priority ordering c) CSMA/CA d) token passing
c) CSMA/CA
What is an ISP? a) It is a standards body that develops cabling and wiring standards for networking b) It is a protocol that establishes how computers within a local network communicate c) It is an organization that enables individuals and businesses to connect to the Internet d) It is a networking device that combines the functionality of several different networking devices in one
c) It is an organization that enables individuals and businesses to connect to the Internet An ISP, or Internet Service Provider, is an organization that provides access to the Internet for businesses and individuals.
What is a characteristic of a WAN hub-and-spoke topology? a) It requires that some of the branch sites be interconnected through point-to-point links b) It requires that every site be interconnected to each other through point-to-point links c) The branch sites are connected to a central site through point-to-point links d) All sites require a hub device that connects to a router
c) The branch sites are connected to a central site through point-to-point links
A network administrator is designing a new network infrastructure that includes both wired and wireless connectivity. Under which situation would a wireless connection be recommended? a) The end-user device only has an Ethernet NIC b) The end-user device requires a dedicated connection because of performance requirements c) The end-user device needs mobility when connecting to the network d) The end-user device area has a high concentration of RFI.
c) The end-user device needs mobility when connecting to the network
Why are open standards important in the data communications industry? a) They are required for devices to gain access to the Internet b) They eliminate the threat of security breaches c) They enable interoperability between software and hardware from different vendors d) They encourage network organizations to develop proprietary software to retain their competitive edge
c) They enable interoperability between software and hardware from different vendors
Which statement describes a characteristic of the frame header fields of the data-link layer? a) They all include the flow control and logical connection fields b) Ethernet frame header fields contain Layer 3 source and destination addresses c) They vary depending on protocols d) They include information on user applications
c) They vary depending on protocols
Which three devices are considered end devices in a network? (Choose three). a) router b) switch c) VoIP phone d) IP camera e) AP (Access Point) f) telepresence endpoint
c) VoIP phone d) IP camera f) telepresence endpoint Routers, switches, and access points are intermediary devices.
What layer of the TCP/IP protocol model determines the best path through the network? a) application b) transport c) internet d) network access
c) internet
What type of delivery uses data-link layer addresses? a) remote delivery b) local and remote delivery c) local delivery d) remote delivery using routers
c) local delivery
What is the general term that is used to describe a piece of data at any layer of a networking model? a) frame b) packet c) protocol data unit d) segment
c) protocol data unit
What is the purpose of protocols in data communications? a) specifying the bandwidth of the channel or medium for each type of communication b) specifying the device operating systems that will support the communication c) providing the rules required for a specific type of communication to occur d) dictating the content of the message sent during communication
c) providing the rules required for a specific type of communication to occur
Refer to the exhibit. One end of the cable is terminated as displayed, and the other end is terminated in accordance with the T568A standard. What type of cable would be created in this manner? a) crossover b) rollover c) straight-through d) fiber-optic e) coaxial
c) straight-through
Which is a function of the Logical Link Control (LLC) sublayer? a) to define the media access processes that are performed by the hardware b) to provide data link layer addressing c) to identify which network layer protocol is being used d) to accept segments and package them into data units that are called packets
c) to identify which network layer protocol is being used
How does BYOD change the way in which businesses implement networks? a) BYOD requires organizations to purchase laptops rather than desktops b) BYOD users are responsible for their own network security, thus reducing the need for organizational security policies c) BYOD devices are more expensive than devices that are purchased by an organization d) BYOD provides flexibility in where and how users can access network resources
d) BYOD provides flexibility in where and how users can access network resources
Which statement correctly describes frame encoding? a) It uses the characteristic of one wave to modify another wave. b) It transmits data signals along with a clock signal which occurs at evenly spaced time durations. c) It generates the electrical, optical, or wireless signals that represent the binary numbers of the frame. d) It converts bits into a predefined code in order to provide a predictable pattern to help distinguish data bits from control bits.
d) It converts bits into a predefined code in order to provide a predictable pattern to help distinguish data bits from control bits.
A college is building a new dormitory on its campus. Workers are digging in the ground to install a new water pipe for the dormitory. A worker accidentally damages a fiber optic cable that connects two of the existing dormitories to the campus data center. Although the cable has been cut, students in the dormitories only experience a very short interruption of network services. What characteristic of the network is shown here? a) quality of service (QoS) b) scalability c) security d) fault tolerance e) integrity f) privacy
d) fault tolerance Fault tolerance is the characteristic of a network which allows it to quickly respond to failures of network devices, media, or services.
Refer to the exhibit. Which term correctly identifies the device type that is included in the area B?
d) intermediary
What type of message is sent to a specific group of hosts? a) static b) dynamic c) unicast d) multicast e) broadcast
d) multicast
Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices? a) application b) presentation c) session d) transport e) network
d) transport
Which message delivery option is used when all devices need to receive the same message simultaneously? a) simplex b) duplex c) full-duplex d) unicast e) multicast f) broadcast
f) broadcast
