Cisco Networking 2
Terms
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- 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 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?
- segments
- What does the Network layer use as a PDU?
- packets (datagrams)
- What does the Data Link layer use as a PDU?
- frames
- What does the Physical layer use as a PDU?
- bits