Chapter 12 - Wide Area Networks Flashcards
WANs connect nodes, such as workstations, servers, printers, and other devices, in a small geographical area on a single network
False
In a frame relay WAN, the ISP typically has the data circuit terminating equipment (DCE)
True
An 802.11ac signal can travel for approximately 2 miles from the source
False
In a public switched telephone network, lines are terminated at the central office.
True
DSL signals travel over telephone lines using the 300 to 3300 Hz frequency range.
False
DSL services require many subscribers to share the same local line, causing potential security concerns
False
Although MPLS can operate over Ethernet frames, it is more often used with other Layer 2 protocols, like those designed for WANs.
True
Most satellites circle the Earth 22,300 miles above the equator in a geosynchronous orbit
True
CDMA (Code Division Multiple Access) is an open standard that is accepted and used worldwide
False
The word “synchronous” as used in the name of Synchronous Optical Network means that data being transmitted and received by nodes must conform to a timing scheme.
True
What is the maximum throughput of a DS3 connection?
44.736 Mbps
Multiplexing enables a single T1 circuit to carry how many channels?
24
In an ISDN connection, what amount of throughput did a single B channel provide?
64 Kbps
What is the size of an ATM cell, including the header?
53 bytes
Which of the following is an advantage of leasing a frame relay circuit over leasing a dedicated circuit?
You pay only for the bandwidth you require.
Of all the DSL standards, which is the most commonly in use today?
ADSL
The DTE or endpoint device for a leased line is known as which device below?
CSU/DSU
What OC level is primarily used as a regional ISP backbone, and occasionally by very large hospitals, universities, or other major enterprises?
OC-48
The C-Band utilized by satellites consists of what frequency range?
3.4 - 6.7 GHz
In metro settings, end-to-end, carrier-grade Ethernet networks can be established via what protocol?
Carrier Ethernet Transport
Which statement regarding the use of cable modems is NOT accurate?
Cable modems only operate at the Physical layer of the OSI model.
The T-carrier standards, also called T-CXR standards, utilize what type of multiplexing over two wire pairs to create multiple channels?
time division multiplexing (TDM)
On an ATM network, how is the path that data will take determined?
Switches determine the optimal path between sender and receiver, and then establish the path before transmission.
What type of virtual circuit allows connections to be established when parties need to transmit, then terminated after the transmission is complete?
switched virtual circuit (SVC)
Which of the following Layer 1 WAN technologies is not normally used as last mile service, but rather traverses multiple ISP networks, connecting these networks to the Internet backbone?
SONET (Synchronous Optical Network)
Where are MPLS labels placed within a frame?
between the layer 2 header and the layer 3 header
What is a data-link connection identifier (DLCI) utilized for?
It is used by routers to determine which circuit to forward a frame to in a frame relay network.
Which statement regarding the Asynchronous Transfer Mode (ATM) technology is accurate?
ATM can provide 4 levels of QoS, from best effort delivery to guaranteed, real-time transmission.
The Global System for Mobile Communications (GSM) utilizes what technology to create timeslots on a channel?
time division multiple access (TDMA)
When using satellite services for your WAN connection, what statement is accurate?
Satellite services suffer more latency and jitter issues.
Considering that multiple users occupy the same channel when using CDMA, how are various calls using this technology kept separate?
The packets are coded such that individual calls can be distinguished.
Which SONET OC level is a popular choice for large businesses, and is equivalent to 100 T1s?
OC-3
With a SIP trunk, what is the only limitation on the number of calls that can run at any one time?
The amount of available bandwidth.
In North America, what ISDN connection type used two B channels and one D channel?
Basic Rate Interface (BRI)
In a public switched telephone network, what portion of the network is known as the local loop?
It is the portion that connects any residence or business to the nearest central office.
Which type of DSL technology has equal download and upload speeds maxing out at around 2 Mbps?
SDSL
When using DOCSIS 3.0, what is the minimum number of channels that can be used?
4
A fractional T1’s bandwidth can be leased multiples of what data rate?
64 Kbps
In a cellular network, where does each wireless base station connect to?
They connect to a mobile switching center.
How many transponders are contained within a typical satellite?
24 to 32
