Homework 5 IT 300

Select the correct statement(s) regarding Frame Relay (FR).

is a connection-oriented standard that operates at the OSI layers 1 and 2

was principally designed for “bursty” digital network traffic

are variable length, therefore packet delays can be unpredictable

Select the correct statement(s) regarding SONET and SDH

An STS-3 equals an STM-1, which is 155.52 Mbps

Which of the following is a class A IPv4 address?

118.20.210.254

How is the channelized T-1 rate of 1.544 Mbps determined?

8000 frames/second ((24 DS0s/frame 8 bits/DS0) + 1 FB)

Select the correct statements regarding TCP

TCP uses windowing as a means to control network congestion

Which of the following allowed third party devices to be electrically connection to the AT&T phone network?

Carterfone decision

Select the correct statement(s) regarding DHCP (dynamic host configuration protocol).

is a protocol that allows nodes to be assigned IP addresses automatically, manually, or on a temporary basis

The motto “One System, One Policy, Universal Service” is associated with which of the below?

AT&T’s justification to monopolize the telephone industry

ICMP is a protocol that does not make IP networks more reliable.

false

Why are the existence of loading coils on local loop lines bad for ADSL?

loading coils in combination with naturally occurring capacitance in UTP LL creates a low pass filter

Select the correct statement(s) regarding Passive Optical Networks (PONs).

uses passive splitters to distribute signals to subscribers

does not require the use of active amplification between CO to the subscriber

operate over SMF optical cables

The Numbering Plan Administration (NPA) offers a hierarchical telephone numbering standard used to quickly connect users without the need to perform exhaustive database searches.

true

Select the correct statement(s) regarding TCP and UDP transport layer protocols.

UDP is a connectionless protocol, therefore correct data sequencing and flow control are not guaranteed

TCP is a connection-oriented protocol which means that a 3 way handshake is required between source and destination prior to data transmission

the combination of port assignment with IP address is termed a socket

What is true regarding Discrete MultiTone (DMT)?

DMT describes the use of OFDM to enable to way FDD communications

Select the correct statement(s) regarding a DS0

DS0s use a bit-depth of 8 bits per sample

DSOs are created using PCM techniques that adhere to Nyquist Sampling Rates

DSO is a digitized analog signal (typically supporting a 4khz bandwidth voice signal)

ARP is a standard protocol that only addresses IP to Ethernet MAC addressing.

false

Given the IPv4 address in CIDR notation 211.200.10.40/27, identify the subnet ID it belongs to.

211.200.10.32

The purpose of the IPv4 "time-to-live" (TTL) is to ensure individual packets remain indefinitely in the network until it reaches its destination.

false

What established the Federal Communications Commission?

Communications Act of 1934

What is a difference between a PBX and Centrex?

PBX is the responsibility the subscriber, while Centrex is managed by the service provider

Since UDP is a connectionless protocol, source and destination ports are not needed within the UDP header.

false

Wireless Local Loop (WLL) does not include the use of free-space optical frequencies.

true

Select the correct statement(s) regarding the channelized T-1 carrier.

channelized T-1 supports 24 DS0s; however, a T-1 frame only supports one byte of each DS0 supported

the T-1 frame length is 193 bits long

the T-1 frame rate must be 8000 frames per second

A SONET network can be supported on a single WDM optical channel (i.e., SONET over WDM).

true

The PSTN incorporates both in-band and out-of-band CCS signaling.  A separate PSTN network  provides internal out-of-band control and signaling, while local loop lines implement in-band control and signaling.

true

DOCSIS was a regulatory policy that merged CATV, PONs, and ADSL into a single Internet access capability.

false

Select the correct statements regarding Asynchronous Transfer Mode (ATM)

ATM is a variable-length cell standard that supports voice, video and data

ATM is connection-oriented

Select the correct statement(s) regarding Wide Area Networks (WANs).

WANs operate at the OSI Layer 3 (network layer)

What are some ways to accomplish full-duplex (FDX) digital communications on guided medium at the physical layer (OSI Layer 1)?

-modulate receive and transmit channels onto different carrier frequencies, thus allowing FDX on the same physical medium

-separate digital receive and transmit paths onto their own physical channels/circuits

-separate transmit and receive channels on the same physical medium by separating them in time

Select the benefits of implementing a NAT

-reduces exposure of the intranet to external internet threats

-enables an intranet to connect to the internet

-helps to extend limited IPv4 addresses

-enables an intranet to easily switch ISPs

Carrier Ethernet services include E-Line, E-LAN, E-Tree, E-Asymmetric, and E-Motive

false

Select the true statement regarding the PSTN architecture.

an interLATA call connects subscribers between different LATAs

Select the correct statement(s) regarding crosstalk interference on ADSL.

service providers must ensure a proper ACR ratio to avoid NEXT or FEXT interference

Why was the internet invented?

it was developed to provide a survival communications system in case of nuclear attack

Select correct statements regarding IPv6

-increases IP addressing space to 128 bits

-simplifies datagram header

-supports quality-of-service

What did the 1982 Modified Final Judgment (MFJ) accomplish?

-enabled competition in the telephone industry which eventually led to innovation

-transformed the 22 Bell Operating Companies into the seven regional bell operating companies

-led to the 1984 divestiture of AT&T

Select the correct statement regarding autonomous systems (AS), autonomous networks (ANs).

IXPs enable the interconnection of separate ASN’s at the OSI layer 1,2,3

Select the correct statement(s) regarding the Domain Name System (DNS).

DNS is accomplished through distributed name resolution servers

DNS enables the URL to remain the same even if the associated IP address changes

DNS enables the building of hierarchial information structures

In an MPLS network, a routing label is affixed to the front of the IP header in order to provide quality-of-service information.  This enables the prioritization of packets through an MPLS network. 

true

Which technology is used with asymmetric DSL (ADSL)?

frequency division multiplexing (FDM)