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34 Cards in this Set

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