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中文描述: 趨勢服務(wù)器PROG。單
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43-TV-25-11 GLO Issue 11 03/02 UK
87
+-0/6/0
Ethernet
Ethernet is a local area network (LAN) technology that transmits information
between computers and other devices, at speeds of 10 to 100 million bits per sec-
ond (Mbps). Each Ethernet equipped device operates independently of all other
devices on the network.
All devices attached to an Ethernet are connected to a shared signalling system.
Ethernet signals are transmitted serially, one bit at a time, over the shared signal
channel attached to each device.
It is up to the high-level protocol that is sending data over the network to make
sure that the data is correctly received at the destination device.
Devices attached to an Ethernet can send application data to one another using
high-level protocol software, such as TCP/IP protocol suite.
High-level protocols have their own system addresses, such as the 32-bit
addresses used in the current version of IP. The high-level IP-based networking
software in a device is aware of its own 32-bit IP address and can read the 48-bit
Ethernet address of its own network interface, but it doesn’t know the Ethernet
addresses of the other devices on the network.
To discover the Ethernet addresses of other IP-based devices on the network
another high-level protocol is used. For TCP/IP, this is done using a protocol called
Address Resolution Protocol (ARP).
Example:
Device X has an IP address of 195.23.37.1 and sends data over the Ethernet
channel to another IP-based device, Device Y with IP address 195.23.37.2. Device
X sends the packets of information containing an ARP request. The ARP request is
asking the device with the IP address of 195.23.37.2 to identify the address of the
Ethernet Interface.
Only Device Y with the IP address of 195.23.37.2 will respond, sending a packet
with the Ethernet address of device Y back to device X. Now device X and Y have
each others Ethernet addresses to which data can be sent.
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