It provides the logical addressing required that identifies the device. It provides delimitation of data according to the physical signaling requirements of the medium.
What is the purpose of the OSI physical layer? The physical layer is responsible for transmitting the actual signals across the physical media as bits. Exchanging frames, controlling media access, and performing error detection are all functions of the data link layer.
What attribute of a NIC would place it at the data link layer of the OSI model? Explanation: The data link layer describes media access and physical addressing. The encoding of a MAC address on a NIC places it at that layer. Ports and cables are placed at the physical layer of the OSI model.
Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame? it floods the frame to all ports except the port on which it received the frame.
What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF? The host will process the frame. The host returns the frame to the switch. The host replies to the switch with its own IP address.
Media Access Control MethodsCarrier sense multiple access with collision avoidance (CSMA/CA) Carrier sense multiple access with collision detection (CSMA/CD)
What three items are contained in an Ethernet header and trailer? (Choose three.)
- source IP address.
- source MAC address.
- destination IP address.
- destination MAC address.
- error-checking information.
The two primary functions of the MAC sublayer are to encapsulate the data from the upper layer protocols and to control access to the media.
The data link layer is the second layer in the OSI Model. The three main functions of the data link layer are to deal with transmission errors, regulate the flow of data, and provide a well-defined interface to the network layer.
A data link layer frame has the following parts: Frame Header: It contains the source and the destination addresses of the frame and the control bytes. Payload field: It contains the message to be delivered. Trailer: It contains the error detection and error correction bits.
Although there are many different data link layer protocols that describe data link layer frames, each frame type has three basic parts: Header. Data. Trailer.
What identifier is used at the data link layer to uniquely identify an Ethernet device? Explanation: Ethernet frames are identified at the data link layer by their MAC addresses, which are unique to each NIC. IP addresses are used at the network layer, and TCP and UDP port numbers are used at the transport layer.
The transport layer ensures the correct web page is delivered to the correct browser window. A corporate worker is accessing a web server located on a corporate network. The transport layer formats the screen so the web page appears properly no matter what device is being used to view the web site.
Question: What action will occur if a switch receives a frame and does have the source MAC address in the MAC table? The switch refreshes the timer on that entry. The switch adds it to its MAC address table associated with the port number.
Question: What OSI physical layer term describes the measure of the transfer of bits across a medium over a given period of time? throughput.
For effective data communication between two directly connected transmitting and receiving stations the data link layer has to carry out a number of specific functions as follows:
- Services provided to the network layer:
- Frame synchronisation:
- Flow control.
- Error control:
- Addressing:
- Control and data on same link:
The data link layer in the OSI (Open System Interconnections) Model, is in between the physical layer and the network layer. This layer converts the raw transmission facility provided by the physical layer to a reliable and error-free link.
The medium access control (MAC) is a sublayer of the data link layer of the open system interconnections (OSI) reference model for data transmission. It controls the transmission of data packets via remotely shared channels. It sends data over the network interface card.
Two types of Data Link layer devices are commonly used on networks: bridges and switches. A bridge is an intelligent repeater that is aware of the MAC addresses of the nodes on either side of the bridge and can forward packets accordingly.
In OSI model Network layer is responsible for 'source-to-destination' delivery of a packet possibly across the multiple networks( links ),whereas the data link layer oversees the delivery of the packets btw 'two' systems on same network.
The physical layer describes the way data is actually transmitted on the network medium. The data link layer defines how these streams of bits are put together into manageable chunks of data. Ethernet is the best known implementation of the physical and data link layers.
Network layer works for the transmission of data from one host to the other located in different networks. It also takes care of packet routing i.e. selection of the shortest path to transmit the packet, from the number of routes available. The sender & receiver's IP address are placed in the header by network layer.
What are the two sizes (minimum and maximum) of an Ethernet frame? (Choose two.) Explanation:The minimum Ethernet frame is 64 bytes. The maximum Ethernet frame is 1518 bytes.
Explanation: Cut-through switching provides lower latency switching for high-performance computing (HPC) applications. The cut-through switching method can make a forwarding decision as soon as it looks up the destination MAC address of the frame.
Explanation:A switch builds a MAC address table by inspecting incoming Layer 2 frames and recording the source MAC address found in the frame header. The discovered and recorded MAC address is then associated with the port used to receive the frame.
Which standards organization oversees development of wireless LAN standards? Explanation: IANA oversees the management of IP address allocation and domain names. ISO is the largest developer of international networking standards and is famous for the Open Systems Interconnection (OSI) model.
