Quiz 01- OSI Model

What is the name of the mechanism used by TCP to increase and decrease the number of segments that are sent between each other before an acknowledgment is required? A. Windowing B. Synchronizing C. Scaling D. Buffering

A

Which of the following is not a characteristic of the Media Access Control (MAC) sublayer of the data link layer (Layer 2) of the OSI reference layered model? A. The use of flow control on a network to prevent a receiver from being overwhelmed. B. The MAC sublayer uses a physical address call a MAC address, which is a 48-bit (6-byte) address assigned to a device network interface card. C. Layer 2 devices view a network as a logical topology. D. Method of transmitting on the media.

A

Which of the following is not a layer of the Open Systems Interconnect (OSI) reference model? A. Internet access layer B. presentation C. physical layer D. data link layer

A

The term packet is used fairly generically to refer to protocol data unit (PDU). There are PDU equivalent names in the different OSI layers. What is the name of the unit in the physical layer of the OSI reference model? A. segments B. bits C. packets D. frames

B

Which of the following layers of the OSI reference model is primarily concerned with forwarding data based on logical addresses? A. physical layer B. network layer C. presentation layer D. data link layer

B

Which of the following transport layer protocol of the OSI reference model is a connection-oriented protocol that provides reliable transport between two communicating hosts? A. Internetwork Packet Exchange (IPX) B. Transmission Control Protocol (TCP) C. Transport Control Protocol (TCP) D. User datagram Protocol (UDP)

B

Which type of transmission synchronization technique uses start and stop bits at the beginning and end of a data frame? A. Synchronous B. Asynchronous C. Biochronous D. Isochronous

B

Physical layer unit

bits

Network layer unit

packets

Transport layer unit

segment

John, the network administrator of XYZ Corporation, is interested in changing the format of text from American Standard Code for Information Interchange (ASCII) to Extended Binary Code Decimal Interchange Code (EBCDIC). In addition, his IT manager requested that all sensitive and confidential information on their servers should be protected by applying the appropriate encryption. What OSI reference model layer is responsible for data format such as encryption? A. Data-link layer (Layer 2) B. Session layer (Layer 5) C. Presentation layer (Layer 6) D. Transport layer (layer 4)

C

On which OSI layer is encryption performed? A. Layer 4 - The network layer B. Layer 5 - The session layer C. Layer 6 - The presentation layer D. Layer 7 - The application layer

C

Which OSI reference model layer is responsible for? (a) Setting up session (b) Maintaining a session (c) Tearing down a session A. Presentation layer (Layer 6) B. Transport layer (Layer 4) C. Session layer (Layer 5) D. Data link layer (Layer 2)

C

Which of the following layers is not part of the TCP/IP protocol stack? A. Internet B. Application C. Transport D. Presentation

D

Which wiring standard is used on modern Ethernet connectors and jacks? A. IEEE 802.2 B. TIA/EIA-568-A C. IEEE 802.3 D. TIA/EIA-568-B

D

At upper layers of the OSI reference model, bits are grouped together into protocol data units (PDUs) or data service units.

True

Broadband bandwidth usage divides the bandwidth into channels for use with multiple communications streams.

True

Switching is associated with Layer 2 (data link layer) and Layer 3 (network layer).

True

Application layer unit

data

Data link layer unit

frames