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192 Cards in this Set
- Front
- Back
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OSI layer 7 |
Application |
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OSI layer 6 |
Presentation |
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OSI layer 5 |
Session |
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OSI layer 4 |
Transport |
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OSI layer 3 |
Network |
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OSI layer 2 |
Data link |
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OSI layer 1 |
Physical |
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What does MAC address stand for? |
Media access control |
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What is a MAC address? |
A 48 bit unique identifier |
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What is a frame? |
A container for a chunk of data moving across a network |
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What makes up a generic frame? |
Recipient MAC, sender MAC, type, data, FCS |
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What does CRC stand for? |
Cyclic redundancy check |
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What does CRC do? |
Verifies that the data arrived intact |
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What is a hub? |
A dumb device that copies frames and sends it to all connected devices on the network |
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What layer does a NIC operate on? |
Layer 2 data link |
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What are the two aspects of a NIC? |
LLC and MAC |
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What does LLC stand for? |
Logical link control |
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What does the LLC do? |
It communicates between the NIC and the OS usually through drivers. It also handles flow control and network protocols |
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What does TCP stand for? |
Transmission control protocol |
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What type of address is a IP adress? |
Logical |
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What is a packet? |
A container inside a frame containing a IP container and the data |
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What does a typical IP packet look like? |
Destination IP, source IP, and data |
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What does a IP packet in a frame look like? |
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What type of frame does a cable modem use? |
DOCSIS |
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The transport layer breaks data up into chunks called |
Segments or datagrams |
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What is the difference between segments and datagrams? |
Datagrams are simpler and don't have sequence numbers |
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What layer does a router work on? |
Layer 3 network |
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What does layer 6 do? |
Presentation layer provides data conversion so applications can use the data |
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What does API stand for? |
Application programming interfaces |
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What does an API do? |
Used to make an application network aware |
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OSI model and what is in each layer |
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What are the four layers of the TCP/IP model? |
Application, transport, internet, and link |
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What type of model is the OSI model? |
Prescriptive |
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What type of model is the TCP/IP model? |
Descriptive |
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What part of the OSI model correlates with the TCP/IP link layer? |
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What part of the OSI model correlates with the TCP/IP Internet layer? |
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What part of the OSI model correlates with the TCP/IP transport layer? |
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What does UDP stand for? |
User datagram protocol |
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What type of connection protocol is UDP? |
Connection-less |
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What type of connection protocol is TCP? |
Connection-oriented |
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What does a typical TCP segment look like? |
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What is a UDP container called? |
Datagram |
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What does a UDP datagram look like? |
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What part of the OSI model correlates with the TCP/IP application layer? |
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What port does HTTP use? |
Port 80 |
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Describe the model layers and the corresponding data structure for encapsulation. |
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What is a bus topology? |
A single cable connecting all computers in a line |
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What is a ring topology? |
Connects all computers on the network with a ring of cable |
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What is a star topology? |
Computers are all connected to a central connection box |
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What is a hybrid topology? |
Any form of networking that combines physical topology with logical topology |
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What are the two types of hybrid topology? |
Star-ring and star-bus |
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Wireless networks use what two topologies? |
Mesh or point-to-multipoint |
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What is a mesh network? |
A network where every computer connects to every other computer via two or more routes |
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What are the two types of meshed networks? |
Partially and fully meshed |
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Where won't you find a partially meshed network? |
Offices |
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What is a partially meshed network? |
A network where at least two machines have redundant connections |
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What is a fully meshed network? |
A network where every computer connects directly to every other computer |
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What is a point-to-multipoint network? |
A single system acts as a common source through which all members converse |
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What is the difference between a star topology and a point-to-multipoint topology? |
Star uses a dumb device to just send or provide a path whereas a point-to-multipoint needs a intelligent device |
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What is a point-to-point network? |
Two computers directly together with no need for a central device |
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What are the two groups of wires? |
Copper and fiber |
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What are the two primary copper cable types? |
Coaxial and twisted pair |
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What type of connector did old bus topology use? |
Bayonet style or BNC earlier ones used vampire connectors |
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What type of connector does a coaxial cable use? |
F-connector |
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What does RG stand for? |
Radio grade |
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How do cable modems connect? |
RG-6 or RG-59 |
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What is the ohm rating of a RG-6 and 59 cable? |
75 ohms |
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What is interference called and how do you prevent it? |
Cross talk, more twists less crosstalk |
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What are the two types of twisted pair cables? |
Shielded and unshielded |
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What cat ratings are still revognized? |
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What is bandwidth? |
The maximum amount of data that goes through a cable per second |
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What does RJ stand for? |
Registered jack |
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What connector do telephones use? |
RJ-11 |
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What connector does ethernet use? |
RJ-45 |
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What are the four components of fiber cable? |
Core, cladding, buffer, and insulating jacket |
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What is the most common fiber cable size? |
62.5/125 um |
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What type of light do most fiber cables use? |
LED |
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A fiber cable using LEDS are called what? |
Multimode fiber (MMF) |
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Fiber optic cables using lasers are calling what? |
Single-sided fiber (SMF) |
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What problem is unique to MMF? |
Modal distortion |
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What wavelength does MMF cables tradition at? |
850nm |
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What wavelength dies SMF cables tradition at? |
1310 or 1550 |
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What are the four fiber connector types? |
ST,SC,LC,FC |
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What does RS stand for? |
Recommended standard |
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What is the most common serial port? |
9 pin male DB-9 |
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What is the data rate for serial ports? |
56,000 bps |
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What is the speed of a parallel port? |
2 mbps |
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What is the most common parallel connector? |
25 pin female DB-25 |
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What are the two most common fire ratings? |
PVC and plenium |
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What does PVC stand for? |
Polyvinyl chloride |
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What is the space between the acoustical tile ceiling and concrete ceiling called? |
Plenum |
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What type of fire rating designates the proper cabling to use for vertical runs between floors? |
Riser |
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What are the two common 802 committees? |
802.3 (ethernet) and 802.11 (WLAN) |
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What us sometimes between the data and FCS section of a ethernet frame? |
Preamble |
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What is a preamble? |
Attached to the front of a ethernet frame with a 7 byte series followed by a 1 byte start frame |
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What does the preamble do? |
Gives the NIC time to realize a frame is coming and where it starts |
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What is the common name for network diagnostic programs? |
Sniffers |
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What is promiscuous mode? |
When a NIC processes all frames it sees regardless of MAC address |
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What does the type field of a ethernet frame do? |
Helps the receiving computer interpret the contents at the basic level |
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What is the purpose of the pad field? |
To fill in empty data in a frame which must be a minimum of 64 bytes |
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What is CSMA/CD? |
Carrier sense multiple access collision detection |
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What is CSNA/CD used for? |
It is used to determine which computer should use a shared cable at a given moment |
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What does carrier sense do? |
Each nde using the network examines the cable before sending a frame |
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What does multiple access mean? |
All machines have equal access to the wire |
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What is the maximum amount if collisions on a properly running network? |
10% |
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What cable is called a thicknet? |
10Base5 |
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What type of ethernet topology is thicknet and thinnet? |
Bus |
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What type of cable is called thinnet? |
10Base2 |
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How far are thinnet networks limited to? |
185 meters |
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What cable does a thinnet use? |
RG-58 coaxial |
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Why is 10BaseT called that? |
10 for the 10 mbps speed, base for the baseband signal type, T for twisted pair |
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What is baseband? |
Means the cable only carries one type of signal |
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How far can thicknet networks go? |
500 meters |
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What do pins 1 and 2 on a RJ-45 connector do? |
Send data |
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What do pins 3 and 4 on a RJ-45 connector do? |
Receive data |
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NICs that can only communicate in one direction at a time are running in what mode? |
Half-duplex |
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NICs that can send and receive at the same time run in what mode? |
Full-duplex |
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What is the connector of an RJ-45 called? |
A crimp |
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What is the color code for TIA/EIA 568A? |
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What is the color code for TIA/EIA 568B? |
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What is the maximum length a twisted pair cable connecting a computer to a hub can be? |
100 meters |
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What is the maximum capacity of nodes for a 10BaseT network? |
1024 |
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What is 10BaseFL? |
A fiber version of 10BaseT |
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What is the maximum length of 10BaseFL? |
2 kilometers |
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What type of connector does 10BaseFL use? |
SC or ST |
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What is the maximum distance of cable for 10BaseFL between the node and hub? |
2000 meters |
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What is acoupler? |
Device used to extend an ethernet segment |
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What is the purpose of a uplink port? |
Allows you to connect two hubs using dtrsight-through cable. One goes in the uplink port the other end goes in a regular port |
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What is MDI? |
Media dependent interface, a regular port |
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What is MDIX? |
Media dependent interface crossover, a uplink port |
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What is the purpose of a cross over cable? |
It reverses the sending and receiving pairs on one end of the wire |
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What is a roll over cable? |
A cable with RJ-45 on one end and a class RS-232 serial port used to connect a node directly to a Cisco switch or router |
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What is a bridge? |
A device that acts like a repeater or hub to connect two ethernet networks but also filters and forwards based on MAC address |
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What layer does a bridge operate on? |
Layer 2 data link for OSI and link for TCP/IP |
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What is the table a switch creates called? |
Source address table |
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What is a bridging loop? |
Switches connected together with redundant connections |
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What is flooding? |
When switches send a query on every port to find the location of a new device |
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What cable does a 100baseT4 use? |
CAT 3 |
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What cable does a 100baseTX use? |
CAT 5 |
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What standard is 1000baseT? |
802.3ab |
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What standard is 1000baseX? |
802.3z |
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What are the other standards for 802.3z? |
1000baseCX, SX, and LX |
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What cable does 1000baseCX use? |
Twinaxial cable |
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What is a twinaxial cable? |
Special shielded 150 ohm cables with a length limit of 25 meters |
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What is the cable length of 1000baseSX? |
220 to 500 meters |
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What is the wavelength of a 1000baseSX cable? |
850 nm |
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What connector does a 1000baseSX use? |
LC |
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What is the distance of 1000baseLX? |
5 to 70 kilometers |
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What connector does a 100baseLX use? |
LC |
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What does SFF stand for? |
Small form factor |
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What does MT-RJ SL stand for? |
Mechanical transfer registered jack |
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What are all the 1000base standards? |
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What is the standard connector for fiber cables? |
PC |
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What does PC connector stand for? |
Physical contact |
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What connector did PC replace? |
Flat surface |
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What does UPC stand for? |
Ultra physical contact |
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What does APC stand for? |
Angled physical contact |
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What is the difference between 10GBaseSR and SW? |
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What is the difference between 10GBaseLR and LW? |
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Of the 10GBe media's which is the most popular and least expensive? |
LR |
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What is the difference between 10GBaseER and EW? |
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What is the maximum length of a 10GBaseT running CAT6? |
55 meters |
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What is a MSA? |
Agreements among multiple manufacturers to make interoperable devices and standards |
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What does MSA stand for? |
Multisource agreements |
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What are the three requirements for a basic structured cabling network? |
A telecommunications room, horizontal cabling, and a work area |
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What is a single piece of installed horizontal cabling called? |
A run |
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What type of cabling does a horizontal cabling use? |
Cat 5 or better utp |
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What are the two types ofUTP? |
Solid and stranded core |
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What is solid core UTP? |
Uses a single solid wire, better conductor but easily breaks |
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What is stranded core UTP? |
Each wire is a bundle of tiny wires, less conductive won't break easy |
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Horizontal cabling should always be what type of UTP? |
Solid |
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What is another name for the telecommunications room? |
Intermediate distribution frame |
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What is the width of a equipment rack? |
19 inches |
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What is another name for a equipment rack that goes floor to ceiling? |
Free standing |
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What is the height measurement of rack mounted equipment called? |
A unit [U] |
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What is a unit worth? |
1.75 inches |
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What are the most common units? |
1,2, and 4U |
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What is a patch panel? |
A box with female ports in the front and permanent connections in the back to connect to horizontal cables |
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What connector does patch panels use? |
110 block sometimes called 110 punchdown block |
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What is the length of patch cables? |
2 to 5 feet |
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What kind of cable are patch cables? |
Straight through stranded UTP |
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What is the demarcation point? |
Marks the physical location if the connection where network responsibility ends |
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What is the name of the demarcation point in a private home? |
Network interface unit |
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What us a customer premises equipment? |
CPE is a box owned by the customer that connects to the demarc and is sometimes called the demarc extension |
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What is the name of the main patch panel? |
Vertical cross connect |
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What is in a main distribution frame? |
Demarc, telephone cross connects, and LAN cross connects |
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What us a cable drop? |
The location where the cable comes out of the wall in the workstation |
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What is attenuationm |
Loss of signal over a great distance |
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What is near end crosstalk? (NEXT) |
When you send a signal on one end and listen on the same end to measure interference on the other pairs |
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What is far end crosstalk? (FEXT) |
When you send a signal on one end and listen on the other end to measure interference on the other pairs |
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What is dispersion? |
When a signal spreads out over long distances |
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Using multiple NICs for a single machine is called what? |
Bonding or link aggregation |
