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44 Cards in this Set
- Front
- Back
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Data link layer allows what? |
Transmission of data across a physical link |
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3 main focuses of data link layer |
Physical addressing MAC Error detection |
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True or false: a switch is transparent to network layer protocols and user apps |
True |
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Frame header contains what |
Layer 2 protocol and media type |
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Frame trailer contains what |
Error detection |
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SOF specific bit sequence? |
10101011 |
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True or false: physical addresses indicate which network the device is apart of |
False. It does not |
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How many bits in an Ethernet Mac address? What are the 2 main components? |
48 OUI, Vendor assigned |
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OUI denote what? |
NIC card manufacturer Also has 2 bits that determine if the frame is a broadcast bit, and/or a locally administered address bit. |
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Vendor assigned address? |
Unique NIC identifier |
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2 main forwarding methods of switches? |
Store n forward Cut through (Fast forward) (Frag free) |
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Define store n forward |
Stores the frame in a buffer until it is fully arrived and performs an error check |
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Define cut through |
Sends frame as soon as destination address is read. Stores just enough in the buffer to send the frame along. |
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Define fast forward switching |
A subtype of cut through. It has the lowest latency, but can contain many errors. Reads only up to the destination address |
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Define fragment free switching |
A subtype of cut through. Performs a small error check on the first 64 bytes of a frame. |
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5 switch basic operations |
Learning Aging Flooding Selective forwarding Filtering |
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Define aging |
Has a timeout for Mac addresses in the Mac table. If no response after 300 seconds, the Mac is deleted. |
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Define ARP and name 2 main functions |
It is a LAYER 2 PROTOCOL Map layer 3 address to layer 2
Send ARP request/reply ARP table |
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2 ways a device can gather Mac addresses |
Monitor traffic ARP request |
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Define spanning tree protocol |
Layer 2 protocol Allows redundancy in the net while eliminating active network loops Places redundant ports into standby as a backup |
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Define broadcast storm |
Switch broadcasts frames endlessly |
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Define multiple frame transmission |
Multiple copies of the same frame arrive at the intended host |
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Define Mac database instability |
Multiple copies of a frame arrive on different ports of a switch |
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Define default VLAN |
Factory created VLAN during initial configuration. All ports are assigned to it. |
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How do switches determine VLAN membership? |
VID (VLAN ID) |
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Between what 2 fields in a frame is the TPID/TAG stored in? |
Source address, length/type |
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How many bytes in a TPID/TAG? |
4, 2 each |
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User priority? |
Expedited transmission |
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CFI? |
Enables token ring frames to be carried across ethernet |
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VID supports up to how many VLAN IDs? |
4096 |
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Native VLAN carries what type of traffic? |
Untagged only |
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Native VLAN characteristics |
Less overhead due to no tags Less traffic |
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Inter VLAN routing goes up to what layer? |
3 |
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Define management VLAN |
Required for remote management |
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2 problems faced in large networks |
Broadcast overload Lack of multiple links |
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Main difference between layer 3 switch and a router |
Packet switching occurs in the hardware for the switch. Software for the router |
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4 considerations when choosing a switch |
Modular/fixed Port density Forward rate PoE |
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Cisco IOS provides 3 things |
Basic routing/switching Network resource access Network scalability |
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IOS is stored where |
Flash 7MB in size |
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3 CLI access methods |
Console Telnet AUX |
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When would you use a console port |
Initial config Password recovery Network service not started/failed |
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AUX is accessed how? |
Telephone dialup through a modem |
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Run and start config are stored where? |
Run: RAM (volatile) Start: NVRAM (nonvolatile) |
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STP IEEE standard? |
802.1D |
