Telecommunications & Networking E1

Which two of the following are included as part of Data Link layer specifications? A. Controlling how messages are propagated through the network. B. identifying physical network devices C. Composition of electrical signals as they pass through the transmission medium. D. Synchronizing individual bits as they are transmitted through the network

A. Controlling how messages are propagated (traveling) through the network. B. Identifying physical network devices *The other functions listed here are performed by the Physical layer.

Which of the following topologies connects each network device to a central hub? A. Star B. Ring C. Mesh D. Bus

A. Star

You have a network that uses a logical bus topology. How do messages travel through the network? A. Messages travel from one device to the next until they reached the destination device. B. Messages are broadcast to all devices connected to the network. C. Messages are sent to a central device which then forwards the message to the destination device. D. Messages are sent directly to the correct destination device.

B . Messages are broadcast to all devices connected to the network (The device in the middle of the star [typically a hub], receives the message and forwards it on to all other devices.)

Which of the following topologies connects all devices to a trunk cable? A. Star B. Bus C. Ring D. Tree

B. Bus

In the OSI model, which of the following functions are performed at the Presentation layer? (Select Two) A. Handle general network access, flow control, and error recovery B. Encrypt and compress data C. Provide network services D. Maintain separate client connections E. Specify data format (such as file formats) F. Transmit data frames

B. Encrypt and compress data E. Specify data format (such as file formats) (The Presentation layer encrypts data, changes and converts character sets, and compresses date. File formats [such as .jpg, .wmv, and .wav] are part of the layer) *The Applications layer provides network services. *The Session layer maintains separate client connections through session IDs, and maintains those sessions. *Flow control and error detection are provided at both the Transport layer and the Data Link layer. *Transmitting frames happens at the Physical Layer

Which of the following are functions of the MAC sublayer? (Select two) A. Mapping hardware addresses to link-layer addresses B. Letting devices on the network have access to the LAN C. Defining a unique hardware address for each device on the network D. Creating routing tables based on MAC address

B. Letting devices on the network have access to the LAN C. Defining a unique hardware address for each device on the network. (MAC sublayer defines a unique MAC or data-link address for each device on the network. This address is usually assigned by the manufacturer. The MAC sublayer also provides devices with access to the network media.)

You have implemented a network where each device provides shared files with all other devices on the network. What type of network do you have? A. Client/server B. Peer-to-peer C. Multiple access D. Polling

B. Peer-to-peer

In the OSI model, what is the primary function of the Network layer? A. Transmits data frames B. Routes messages between networks C. Allows applications to establish, use, and end a connection D. Ensures that packets are delivered with no loss or duplication

B. Routes messages between networks

In the OSI model, which of the following functions are performed at the Application Layer? (Select all that apply) A. Data translation B. Conversation identification C. Enabling communication between network clients and services D. Integration of network functionality into the host operating system

C. Enabling communication between network clients and services D. Integration of network functionality into the host operating system (Applications actually run above the OSI Application layer.) *Conversation identification is accomplished at the Session layer through connection or transaction ID numbers. *Data translation is performed at the Presentation layer.

The Data Link Layer of the OSI model is comprised of two sublayers. What are they? (Select two.) A. LAT B. SAN C. MAC D. LLC E. DLC

C. MAC (Media Access Control) Sublayer - translates generic network requests into device-specific terms, D. LLC (Logical Link Control) Sublayer - provides the operating system link to the device driver

You have implemented an ad-hoc wireless network that doesn't employ a wireless access point. Every wireless network card can communicate directly with any other wireless network card on the network. What type of physical network topology has been implemented in this type of network? A. Bus B. Ring C. Mesh D. Star E. Tree

C. Mesh (Uses a physical mesh topology; Key characteristics of a mesh topology are: *There's no central connecting point. *Any host can communicate directly with any other host on the network. This mesh network is usually impractical on a wired network. Each host would have to have a separate, dedicated network interface and cable for each host on the network. However, a mesh topology can be implemented with relative ease on a wireless network due to the lack of wires.)

Which of the following geographic network types are typically managed by a city as a public utility? A. Wide Area Network (WAN) B. Personal Area Network (PAN) C. Metropolitan Area Network (MAN) D. Local Area Network (LAN)

C. Metropolitan Area Network (MAN)

You have been asked to implement a wired network infrastructure that will accommodate failed connections. You don't have a large budget, so you decide to provide redundancy for only a handful of critical devices. Which of the following network topologies should implement? A. Full Mesh B. Star C. Partial Mesh D. Bus

C. Partial Mesh (only some redundant paths exist. A partial mesh is more practical and less expensive than a full mesh.) *Full mesh topology, every device has a point-to-point connection with every other device; this provides full redundancy, but it is expensive and impractical. *A star topology connects network devices to the network with a single patch cable; the failure of a patch cable makes the connected device unavailable. *A bus topology has a single point of failure. If there is a break in the network media, the network will be unvavailable.

Which OSI model layer is responsible for guaranteeing reliable message delivery? A. Data Link B. Application C. Transport D. Session

C. Transport (Transport layer is responsible for connection services that provide reliable message delivery through error detection and correction mechanisms. Specifically, the TCP protocol provides these services.)

You have implemented a network where hosts are assigned specific roles, such as for file sharing and printing. Other hosts access those resources but do not host services of their own. What type of network do you have? A. Peer-to-peer B. Extranet C. Intranet D. Client-server

D. Client-server

You want to implement a fault tolerant topology as you interconnect routers on your wide area network. Which of the following would meet your needs? A. Star B. Bus C. Ring D. Mesh

D. Mesh (Mesh topology has multiple connections at each node, increasing connectivity fault tolerance. None of the other topologies have native fault tolerance built in.)

You have been asked to implement a network infrastructure that will accommodate failed connections. Which of the following network topologies provides redundancy for a failed link? A. Bus B. Star C. Ring D. Mesh

D. Mesh (Each network device is interconnected to all other network nodes. This creates multiple data paths and in the event of a failed link, the data has an alternate route to arrive at its destination.) *The star topology connects network devices to the network with a single patch cable and the failure of a patch cable will make the connected device unavailable. *The bus topology has a single point of failure, if there is a break in the network media, the network will be unavailable. A single break in a physical ring topology will disable the network.

You have a network that uses a logical ring topology. How do messages travel through the network? A. Messages are sent to a central device which then forwards the message to the destination device. B. Messages are sent to all devices connected to the network. C. Messages are sent directly to the destination device only. D. Messages travel from one device to the next until they reached the destination device.

D. Messages travel from one device to the next until they reached the destination device. (If the message is not intended for that device, the message is forwarded to the next device on the network.)

Which of the following functions are performed at the Physical layer of the OSI model? A. Data translation B. Enablement of network services C. Provision of an environment in which to run network applications D. Movement of data across network E. Conversation identification

D. Movement of data across network cables (Concerned with how to transmit data and how to connect network hosts)

In which of the following topologies does each device on the network act as a repeater, sending the signal to the next device? A. Bus B. Tree C. Star D. Ring

D. Ring

Which of the following topologies connects each device to a neighboring device? A. Star B. Tree C. Bus D. Ring

D. Ring

You have a small network that uses a hub to connect multiple devices. What physical topology is used? A. Mesh B. Bus C. Ring D. Star

D. Star (Hub creates a network with physical star topology. The physical star topology uses a logical bus topology, where messages are sent to all devices connected to the hub.) *A mesh topology is a series of point-to-point link between devices. *A ring topology uses a central device called an MSAU.

What device is used to create a physical star topology? A. Firewall B. Bridge C. Router D. Switch

D. Switch (or a hub) (Routers are used to connect multiple subnets together.) * A firewall is a router that performs filtering on packets or other information contained in network communications.