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29 Cards in this Set
- Front
- Back
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In practice, the clocking concept includes a _______ of different clock sources
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hierarchy
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DCE
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Data Communications Equipment
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DTE
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Data Terminal Equipment
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CSU/DSU
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Channel Service Unit / Data Service Unit
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The device that provides clocking is referred to as the (DCE/DTE)?
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DCE
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The device that receives clocking is referred to as the (DCE/DTE)?
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DTE
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Today, most telcos offer leased lines in multiples of __kbps
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64
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Speed of DS0
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64kbps
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Speed of DS1
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1.544 Mbps
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DS1 is also known as ______
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T1
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Speed of T1
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1.544 Mbps
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Speed of DS3
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44.736 Mbps
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DS3 is also known as _____
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T3
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Speed of T3
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44.736 Mbps
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The two most popular data link layer protocols used on point-to-point links are?
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HDLC and PPP
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The address field in HDLC is usually un-necessary becuase?
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In a point-to-point link, there can only be one possible recipient for the frame.
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The proprietary Cisco HDLC frame adds what field?
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Type
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The Address field in HDLC was useful in the past, when the telco would sell ________
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multidrop circuits
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T/F: Cisco uses the same values in its 2-byte HDLC Protocol Type field as it does in the Ethernet Protocol Type field
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True
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T/F: The PPP frame looks identical to the Cisco proprietary HDLC frame
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True
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For a Frame Relay service, a leased line is installed between each router and a nearby Frame Relay switch. These lines are called ______
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access links
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The address field used by Frame Relay is called _______
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DLCI
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DLCI
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Data Link Connection Identifier
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The Frame Relay header and trailer are defined by a protocol called _________
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Link Access Procedure - Frame
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LAPF
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Link Access Procedure - Frame
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The logical path that a frame travels between each pair of routers in a Frame Relay system is called a _______
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Virtual Circuit
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T/F: CIR represents the maximum data rate over a particular VC
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False
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CIR
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Committed Information Rate
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T/F: CIR represents a minimum data rate over a particular VC. The actual maximum data rate is usually higher.
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True
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