Ccna4 Ch 1
CHAPTER 1
INTRIDUCTION TO WAN
1.1.1 Introducing Wide Area Networks (WANs)
Which statement is true about the differences between a WAN and a LAN? ← WANs generally support higher bandwidth than LANs support. ← A WAN link typically traverses shorter geographic distances than a LAN link traverses. ← A WAN often relies on the services of carriers, such as telephone or cable companies, but a LAN does not. ← All WAN implementations generally use the same Layer 2 protocol but there are many accepted LAN Layer 2 protocols in use.
1.1.3 The Evolving Network Model
Which statement is true of the functionality of the layers in the hierarchical network model? ← The purpose of the access layer is to provide very high bandwidth communications between network devices. ← Most security screening to prevent unauthorized entry to the network happens at the core layer. ← Untrusted external connections are segmented from the rest of the network at all three levels. ← The distribution layer aggregates WAN connections at the edge of the campus.
1.2.1 WAN Technology Overview
At which two layers of the OSI model does a WAN operate? (Choose two.) □ Physical Layer □ Data Link Layer □ Network Layer □ Transport Layer □ Presentation Layer □ Application Layer
1.2.1 WAN Technology Overview
Which three WAN devices can be found in the cloud? (Choose three.) □ ATM switches □ core routers □ CSU/DSU □ Ethernet switches □ Frame Relay switches □ repeaters
1.2.2 WAN Physical Layer Concepts
Which networking device is typically used to concentrate the dial-in and dial-out traffic of multiple users to and from a network? ← core router ← access server ← Frame Relay switch ← ATM switch
1.2.2 WAN Physical Layer Concepts
For digital lines, which device is used to establish the communications link between the customer equipment and the local loop? ← CSU/DSU ← Frame
INTRIDUCTION TO WAN
1.1.1 Introducing Wide Area Networks (WANs)
Which statement is true about the differences between a WAN and a LAN? ← WANs generally support higher bandwidth than LANs support. ← A WAN link typically traverses shorter geographic distances than a LAN link traverses. ← A WAN often relies on the services of carriers, such as telephone or cable companies, but a LAN does not. ← All WAN implementations generally use the same Layer 2 protocol but there are many accepted LAN Layer 2 protocols in use.
1.1.3 The Evolving Network Model
Which statement is true of the functionality of the layers in the hierarchical network model? ← The purpose of the access layer is to provide very high bandwidth communications between network devices. ← Most security screening to prevent unauthorized entry to the network happens at the core layer. ← Untrusted external connections are segmented from the rest of the network at all three levels. ← The distribution layer aggregates WAN connections at the edge of the campus.
1.2.1 WAN Technology Overview
At which two layers of the OSI model does a WAN operate? (Choose two.) □ Physical Layer □ Data Link Layer □ Network Layer □ Transport Layer □ Presentation Layer □ Application Layer
1.2.1 WAN Technology Overview
Which three WAN devices can be found in the cloud? (Choose three.) □ ATM switches □ core routers □ CSU/DSU □ Ethernet switches □ Frame Relay switches □ repeaters
1.2.2 WAN Physical Layer Concepts
Which networking device is typically used to concentrate the dial-in and dial-out traffic of multiple users to and from a network? ← core router ← access server ← Frame Relay switch ← ATM switch
1.2.2 WAN Physical Layer Concepts
For digital lines, which device is used to establish the communications link between the customer equipment and the local loop? ← CSU/DSU ← Frame