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What does the format for Ethernet frames specify?
destination (physical/hardware address) Source (physical/hardware address) Start flag (start of message indicator) Recipient sender encapsulated data end of frame
What security advantage occurs from Packaet's containing the source NIC address and not just the destination NIC address?
The message must travel from your computer to your router. Every computer connected to a network has a network interface card (NIC) with a unique physical address, called a MAC address (for Media Access Control). At the data link level, two more headers are added, one for your computer's NIC address (the source MAC) and one for your router's NIC address. A data link layer structure with destination MAC, source MAC, and data is called a frame. Every NIC selects from the network those frames with its own address as a destination address. The data link layer adds the structure necessary for data to get from your computer to another computer (a router is just a dedicated computer) on your network. Data Link Layer Transformation.
Suppose a computer sends a frame to another computer on a bus topilogy.The physical destination address at the frame is corrupted during the transmission.what happen to the frame?
The frame should be still stored on the origianal source and for the other physical destination it is now scrambled or missing crusial data. but it still gets stored usally as a temporary file or it is dumped
What layer of the ois model adds source and destination MAC address to frames?
in the osi model data link layer is adds source & destination mac address to frames
What are two primary responsibilities of the Ethernet MAC sublayer?
MAC provides physical addressing. The BIA (Burn In Address) which is stored in RAM when the computer boots up is added to each frame that is created as the source mac address. But to answer your question, the MAC layer does the following: Data Encapsulation and Media Access Control.
What type of address identifies the source of data in a frame?
MAC
What is the unit of information called when a network adapter adds the source and destination MAC address to the segment of data before it is transmitted on the network?
Packet
What is the purpose of the 7-byte preamble and 1-byte start-of-frame delimiter on an Ethernet frame?
The purpose is the preamble signals to the receiving node that data is incoming and indicates when the data flow is about to begin. The SFD (start-of-frame delimiter) identifies where the data field begans.
At what layer a NIC identifies itself using the MAC address?
Data Link Layer...
In which of the following would be found in a data link layer header?
The data link layer header contains the source's physical address. It refers the address that is found in the Network Interface Card.
What does the format for Ethernet frames specify?
destination (physical/hardware address) Source (physical/hardware address) Start flag (start of message indicator) Recipient sender encapsulated data end of frame
Which identifies the VLAN to switch each piece of data to where it belongs?
If a switch receives a frame (a piece of data) from a certain port, it will identify that as belonging to a certain VLAN, because each port is assigned a certain port.In a trunk link, additional data is added to each frame (frame tagging), to identify to which VLAN each frame belongs.
How does a computer on a LAN detect an error in a frame?
It calculates a check-sum from the data in the frame and sends it to the source for verification
What protocols are in the Ethernet frame?
The ethernet frame carries the IP (Internet Protocol) The Ethernet frame is made up of the following: 7 BYTE PREAMBLE 1 Byte "Start OF Frame" delimiter 6 byte destination address 6 byte source address 2 byte length or type 46 - 1500 bytes variable 802.2 or ethernet header and data 4 byte Frame Check sequence
What acronym is used to reference the data link sublayer that identifies the network layer protocol encapsulated in the frame?
LLC Logical Link Control
What security advantage occurs from Packaet's containing the source NIC address and not just the destination NIC address?
The message must travel from your computer to your router. Every computer connected to a network has a network interface card (NIC) with a unique physical address, called a MAC address (for Media Access Control). At the data link level, two more headers are added, one for your computer's NIC address (the source MAC) and one for your router's NIC address. A data link layer structure with destination MAC, source MAC, and data is called a frame. Every NIC selects from the network those frames with its own address as a destination address. The data link layer adds the structure necessary for data to get from your computer to another computer (a router is just a dedicated computer) on your network. Data Link Layer Transformation.
Select the one that best describes the contents of a typical network frame?
senders MAC address, recipients MAC address, data, CRC RECIPIENTS MAC ADDRESS, SENDERS MAC ADDRESS, DATA,CRC RECIPIENTS IP ADDRESS, SENDERS IP ADDRESS, DATA, CRC RECIPIENTS EMAIL ADDRESS, SENDERS EMAIL ADDRESS,DATA,CRC
