2.2.7 OSI Networking Model

The following items describe the functions performed at various OSI model layers: 1. Logical topology, hardware addresses, media access, framing 2. Logical device identification, path identification, and selection 3. Flow control, reliable data transfer, windowing, segmentation, and sequencing 4. Converting data to 0s and 1s, bit signaling, and synchronization Which of the following correctly identifies, in order, the layers that perform each of the functions listed here?

Data Link, Network, Transport, Physical

Which of the following are functions of the MAC sublayer in the OSI model? (Select two.)

Defining a unique hardware address for each device on the network. Letting devices on the network have access to the LAN.

What is the purpose of the CRC in network communications?

Detect data errors

Match the TCP/IP protocols with their functions.

Group 1 Used to get the IP address of a host from a known MAC address. RARP, BOOTP Group 2 Used to transfer files. FTP, TFTP Group 3 Used to identify routes through an internetwork. RIP, OSPF

Which two of the following functions are performed by IP? (Select two.)

Identifying hosts with the IP address. Routing datagrams to their destination.

Put the OSI model layers in order.

Layer 7 - Application Layer 6 - Presentation Layer 5 - Session Layer 4 - Transport Layer 3 - Network Layer 2 - Data Link Layer 1 - Physical

Drag the information type on the left to the appropriate layer of the OSI model that it is associated with on the right.

Network Layer - Packets Data Link Layer - Frames Physical Layer - Bits Transport Layer - Segments Application Layer - Data

Which of the following are limitations of the OSI model? (Select two.)

OSI layers are theoretical and do not actually perform real functions. A particular protocol implementation may not represent every OSI layer.

A client computer starts to download some files from an FTP server named FTPsvr1. While the first download is in progress, the user opens a second instance of the FTP program and initiates a second download. What do the server and the client use to keep each download separate?

Session ID

Match the TCP/IP protocols with their functions.

Used to send email messages between mail servers. SMTP Used to send messages to groups of users. IGMP Used to assign IP addresses to hosts. DHCP Used to get the MAC address of a host from its IP address. ARP