QUESTION 11
What replaced X.25?
A. Frame Relay
B. ATM
C. ISDN BRI
D. DSL
Correct Answer: A
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Defining Frame Relay
Explanation: Frame Relay is the advancement of X.25 packet switching. It is a newer form of packet switching
designed for faster connections.
QUESTION 12
At what speed does a T3 line run?
A. 1.5 Mbps
B. 4.5 Mbps
C. 44.7 Mbps
D. 128 Mbps
Correct Answer: C
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Defining T-Carriers
Explanation: T3 stands for trunk carrier 3 and is the equivalent of 28 T1s. It runs at 44.736 Mbps, using 672 64
Kbps B channels.
QUESTION 13
In Europe, what circuit would be similar to the T1 found in the United States?
A. E1
B. J1
C. T2
D. F1
Correct Answer: A
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Defining T-Carriers
Explanation: T1 and T3 are the names used in the United States. In Japan, they are also known as J1/J3, and
in Europe, they are denoted E1/E3. Different from a T1, E1 runs at 2.048 Mbps.
QUESTION 14
How many B channels does an ISDN PRI support?
A. 2
B. 8
C. 23
D. 48
Correct Answer: C
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Defining Other WAN Technologies and Internet Connectivity
Explanation: A primary rate ISDN (PRI) is 1.536 Mbps, and it runs on a T1 circuit. PRI has 23 equal 64 Kbps B
channels for data, along with one 64 Kbps D channel for timing.
QUESTION 15
What speed does FDDI use?
A. 10 Mbps
B. 44 Mbps
C. 54 Mbps
D. 100 Mbps
Correct Answer: D
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Defining Other WAN Technologies and Internet Connectivity
Explanation: Fiber distributed data interface (FDDI) is a standard for transmitting data on optical fiber cables at
a rate of around 100 Mbps.
QUESTION 16
What topology does FDDI use?
A. bus
B. star
C. ring
D. mesh
Correct Answer: C
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Defining Other WAN Technologies and Internet Connectivity
Explanation: FDDI uses the ring topology.
QUESTION 17
What technology uses wires from the telephone company to provide broadband Internet connection?
A. cable
B. DSL
C. FDDI
D. Frame Relay
Correct Answer: B
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Digital subscriber line (DSL) is a family of technologies that provides data transmissions
over local telephone networks.
QUESTION 18
_________ is used to send packets from one network to another network.
A. Routing
B. Transport
C. BGP
D. Encapsulation
Correct Answer: A
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Understanding Routing
Explanation: Routing is the process of moving data across networks or internetworks between hosts or
between routers themselves. Information is transmitted according to the IP networks and individual IP
addresses of the hosts in question.
QUESTION 19
_________ is a route that must be manually defined on each router.
A. Static
B. Dynamic
C. Persistent
D. Global
Correct Answer: A
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Understanding Routing
Explanation: Static routing refers to the manual configuration of a router. For example, when a routing entry is
manually entered into the routing table with the route add command, this is known as static routing.
QUESTION 20
_________ uses a clocking circuit to control the timing of communications between two WAN devices such as
routers.
A. Static Route
B. Dynamic Route
C. PPTP Route
D. Point To Point
Correct Answer: A
Section: Understanding Wide Area Networks
Explanation
Explanation/Reference:
Section Reference: Defining X.25
Explanation: Digital lines have speeds of 64K or greater. It is also synchronous, which means that a clocking
circuit controls the timing of communications between the different routers.