Wide Area Networks (WAN) Flashcards
1
Which of the following is not a WAN protocol or technology?
a/ ATM
b/ ISDN
c/ MPLS
d/ RIP
1
d/ Routing Information Protocol (RIP) is not a WAN protocol but a routing protocol used in internet works.
2
What OSI model layers do WAN protocols operate in?
a/ Layer 6, Layer 4, Layer 2
b/ Transport, Data Link, Network
c/Physical, Data Link, Network
d/Application, Data Link, Network
2
Answer:
c/ These different protocols and technologies all occupy the lower three layers of the OSI model: the Physical layer, the Data Link layer, and sometimes the Network layer. Most WAN protocols work only at the Physical layer and Data Link layer.
3
If you have a device in a telecommunications closet owned and installed by the telecommunications company (telco) and it’s your responsibility to cable from this box to the CPE, which term should you use to refer to the device?
a/ Customer premises equipment
b/ Demarcation point
c/T oll network
d/ Central office
3
b/ Demarcation Point
4
You have an E1. How many DSOs are used in this point-to-point connection?
a/24
b/25
c/30
d/32
4
d/ The European version of the T1 is the E1, which operates at 2.048 Mbps and uses 30 64 Kbps channels (30 DS0s), and two channels are used for D channels, which makes 32 total DS0s.
5
Where does the local exchange carrier responsibility end and your responsibility begin on a WAN link?
a/ POP
b/Central office
c/ Demarc
d/ Smart jack
5
c/ The demarc is the precise spot where the service provider’s (local exchange carrier’s) responsibility ends and the CPE begins. It’s generally a device in a telecommunications closet owned and installed by the telecommunications company (telco).
6
You have a small office, home office environment. What WAN technology would most likely be used?
a/ T1
b/ T3
c/ Frame Relay
d/ Cable modem
6
Answer:
d/ Cable is a great cost-effective connection for a small office or home office (SOHO).
7
Which type of communication has a line speed of 1.544 Mbps (millions of bits per second)?
a/ T3
b/ T1C
c/ T1
d/ T4
7
c/ A T1 has a line speed of 1.544 Mbps. This 1.544 Mbps connection uses Digital Signal 1 (DS1) and aggregates 24 discrete 64 Kbps channels that use Digital Signal 0 (DS0). Other T-series connections have greater maximum connection speeds.
8
Which cellular WAN technology has the best data rate?
a/ HSPA
b/ HSPA+
c/ LTE
d/ WiMAX
8
c/ LTE is true 4G and has the best data rates.
9
Which is not a common optical carrier level (OC-x)?
a/ OC-1
b/ C-4
c/ OC-12
d/ OC-192
9
b/ OC-1, OC-3, OC-12, OC-48, and OC-192 are the normal service offerings. OC-1 has the lowest data rate at 51.84 Mbps, and OC-192 is the highest at 9.953 Gbps.
10
Which wireless protocol utilizes a short-range communications technology facilitating data transmission from fixed and/or mobile devices, creating wireless personal area networks (PANs)?
a/ Bluetooth
b/ Microwave radio relay
c/Comsat
d/ Point-to-multipoint
10
b/ Bluetooth uses a radio technology called Frequency Hopping Spread Spectrum. It chops up the data being sent and transmits chunks of it through the air on up to 75 different frequencies.
