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34 Cards in this Set
- Front
- Back
What is the purpose of the Data Link layer?
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to provide reliable transfer of data across a physical network link
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What layer is responsible for sequencing data frames?
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Data Link layer
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What layer is responsible for flow control?
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the Data Link layer
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What are the two parts of a MAC address?
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24-bit Organizationally Unique Identifier (OUI) and 24-bit vendor-supplied number
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What is another name for a MAC address?
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a burned-in address (BIA)
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How long is an IPX address?
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80 bits (10 bytes)
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What are the two parts of an IPX address?
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4-byte network address and 6-byte node address (MAC address)
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What are the 3 methods of mapping network addresses to MAC addresses?
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ARP, Hello protocol, & predicatable MAC addressing
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What does an IP host do when it needs to find the MAC address of a local host?
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it sends an ARP request
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What layer does the Hello protocol operate at?
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the Network layer
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How does the Hello protocol work?
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hosts periodically broadcast their MAC address
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How does predictable MAC addressing work?
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the MAC address of the host is embedded in the network address
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What three protocols use predictable MAC addressing?
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Xerox Network Service (XNS), Novell IPX, & DECnet
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What two types of packets do routers send?
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data packets and route update packets
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What layer(s) can alter data?
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only the Presentation layer
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What layer is responsible for keeping different appliation's data separate?
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the Session layer
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What specification defines the MAC sublayer?
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IEEE 802.3
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What does the MAC sublayer define?
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how packets are placed on the media
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What specification defines the LLC sublayer?
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IEEE 802.2
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What does the LLC sublayer do?
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identifies network-layer protocols and encapsulates them
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What layer does Data Communicaton Equipment (DCE) operate at?
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the Physical layer
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What layer does Data Terminal Equipment operate at?
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the Physical layer
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What layer do Channel Service Units/Data Service Units (CSU/DSU's) operate at?
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the Physical layer
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Where is Data Terminal Equipment (DTE) usually located?
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at the service provider
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Where is Data Terminal Equipment (DTE) usually located?
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at the client end
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What are Client Service Units/Data Service Units (CSU/DSU's) used for?
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accessing DTE services
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What are three reasons for using a layered model?
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ease of troubleshooting; standard interface; and industry specialization
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How long are IPX addresses?
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80 bits (10 bytes)
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What comprises an IPX address?
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1st 4 bytes: network address; rest: node address (MAC address)
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What does each layer of the OSI model use to encapsulate data?
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Protocol Data Units (PDU's)
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What does the Transport layer use as a PDU?
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segments
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What does the Network layer use as a PDU?
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packets (datagrams)
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What does the Data Link layer use as a PDU?
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frames
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What does the Physical layer use as a PDU?
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bits
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