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Switching&VLANS

QuestionAnswer
What OSI layer does a switch operate on? L2, unless its an intellegent switch that can operate on L#
Name the functions of switches -transfer data withinn the LAN using L2 protocols -address learning -can not break up broadcast domains -breaks up collision domains -loop avoidance
what is address learning? switches learnign address by reading the PDU frams source address
What is L2 of the OSI model? data-link layer
What is loop avoidance? a feature of switches using STP to avoid repeating paths to get to a destination
What happens when network topology changes? 1. Blocing, all traffic stops for 50 secs 2. listening, exchanging bridge protocol data units and checking for loops 3. learning all MAC addresses 4. forwarding
forwarding delay the process in the switch where it learns all MAC addresses before it can be forwarded
What are the three modes for frame handling? 1. cut-through, 2. fragment free, and 3. store-and-forward
cut-through mode frame handling mode that is the fastest, only the headeris checked (1st 13 bytes)
Fragment Free mode frame handling mode that reads the first 64 bytes checking for collision damage before forwarding...default mode for isr19XX series
store and forward mode entire frame check, reject if too short (<64) and reject if too long (>1518B) or if it has CRC failure, greatest latency
What are the benifits to VLAs? -improve security -improve performance -simplify computer movves, adds and changes -cuts administraive costs
Access link port any ports connected to hosts. each access port is a member of a VLAN although host using the port is unaware of this b/cVLAN info is stripped from incoming frames
Trunk link port ports connect all or several VLANs from switches to routers, servers. or other switches. can have up to 1005 VLANs at one time. only one connection to the router
tagging is a LS means of identifying Eth frames by their VLAN membership... tagging assigns each frame a unique user-defined VLAN-ID or color. Fames are first tagged when thy go down a trucnked link, the switch then decides whether to send it on on another
ISL inter-Switch Link a Cisco proprietary method using only Fast- or Gigabit Eth . it is an external tagging method in which the original frame is not altered but further encapsulated in a new 26byte header and 4byte FCS tail
DTP Dynamic Trunking Protocol ...point to point protocol for 802.1 q used by newer cisco catalyst switches to control trunks in IS: or 802.1q
Created by: carly.files
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