Transparent Bridges and Transparent Bridging
Date: 2015-10-07; view: 456.
Read the text and fill in prepositions from the box.
A) Each of the sentences below summarizes an individual paragraph of the text. Order the sentences so that they form a summary of the text.
| a | A separate route for incoming and outgoing data eliminates problems of data collision. | □ |
| b | As a rule, simple networks have nodes that are arranged in a bus or ring topology. | □ |
| c | In a LAN switch network, a data packet does not get broadcasted to unnecessary segments, minimizing congestion and conserving bandwidth. | □ |
| d | All these network topologies suffer from inefficient bandwidth usage, low speeds and data collisions. | □ |
| e | A LAN switch is a good replacement to a network hub. | □ |
| f | There is also a star-like arrangement where all nodes are connected to a hub. | □ |
| g | The LAN switch can identify the source and destination node of a data packet and forward the packet only to the destination node. | □ |
| h | LAN is the geographically limited network. | □ |
| i | In a LAN switch network, each node gets a dedicated connection to the switch. | □ |
| j | LAN consists of various nodes that are able to communicate with each other. | □ |
| on of without to in at with between to in for with to from |
Transparent bridges are devices which connect more than one network segments ___ other bridges to make all routing decisions. A transparent bridge is essentially used to learn the MAC addresses of all nodes and their associated port, to filter incoming frames whose destination MAC addresses are located on the same incoming port, and to forward incoming frames ___ the destination MAC through their associated port.
There are two types ___ Transparent Bridge Modes:
1. Store-and-Forward: Stores the entire frame and verifies the CRC before forwarding the frame. If a CRC error is detected, the frame is discarded.
2. Cut-Through: Forwards the frame just after it reads the destination MAC address ___ performing a CRC check.
Transparent bridging is a method to connect two similar network segments ___ each other ___ the data link layer. It is done in a way that is transparent to end-stations, hence end-stations do not participate ___ the bridging algorithm.
Transparent bridges are sometimes called learning bridges. When they are turned on and receive data packets ___ a network segment they:
1) learn the relation ___ MAC address and segment/port, and
2) forward the packet ___ all other segments/ports.
The first step ___ this process is essential to the "learning" aspect of the bridge. After some time the bridge has learned that a particular MAC address, say MAC A, is ___ a particular segment/port, say PORT1. When it receives a packet destined ___ the MAC address MAC A (from any port not being PORT1) it will no longer forward the packet to all ports (step 2). It knows that MAC A is associated ___ PORT1 and will only forward the packet to PORT1.
(By Bradley Mitchell)
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| The LAN switch | | | Коммутация «на лету» и с буферизацией. |