Quản trị mạng Chapter2

Phung Manh Duc - Take Exam
Exam questions
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1 . What is the defined standard for the DCE/DTE interface?
RS-232-C
EIA/TIA-232
IETF DCE/DTE interface specification
RFC 232

2 . Which of the following are true? Choose two.
DTE = Data Terminal Equipment(PC’s, workstations, Mainframes)
DCE = Data Communications Equipment(PC’s, workstations,Mainframes)
DCE = Data Communications Equipment(modems, CSU/DSU’s)
DTE = Data Terminal Equipment(modems, CSU/DSU’s)

3 . With asynchronous communication, which three of the eight pins in a DB25 connector are used to handle modem control? Choose
three.
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 20

4 . Which command is used to enable asynchronous dialup on a serial interface?
physical-mode async
dialer-group layer async
physical-layer async

modem inout

5 . What are three functions that chat scripts perform?
SNMP management
modem configuration
failure detection
dialing and remote login

6 . Which one of the following modem commands on a USR modem shows the settings and configuration?
AT and F
ATI4
ATE0
ATM0

7 . With asynchronous communication, which three of the eight pins in a DB25 connector are used for data transfer? Choose three.
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 20

8 . Frame Relay describes the interconnection process between which two types of equipment?
DTE and DTE
DCE and DCE
CPE and DTE
CPE and DCE

9 . When a modem powers up, how does the connected computer know that the DCE is ready to use?
The modem sets DTR pin 20
The modem sets DSR pin 5
The modem sets DSR pin 6
The modem sets DTE pin 4

10 . Which three statements are true regarding the command “telnet 10.10.30.4 2009”?
It is used to reverse Telnet using port 2009.
It is used to access port 2009 on a specific device.
A modem is connected to line 9.
It specifies a BRI connection to be used for Telnet.
The “modem inout” command has not been configured on the line.

11 . Which command will allow a router to attempt to discover the modem to which it is attached?
modem autoconfigure discovery
modem discovery autoconfigure
modem autoconfigure type discovery
modem discovery type autoconfigure

12 . What are the three types of modulation within asynchronous signaling?
parity
amplitude
frequency
phase

13 . When configuring an asynchronous line, what is the result of issuing the command “flowcontrol hardware”?
It sets RAM aside to buffer incoming and outgoing data.
It sets the line to use CTS/RTS flow control.
It sets the modem to handle flow control instead of the router.
It sets the modem to use MNP4 firmware.

14 . On the digital end, a modem should be set:
As fast as it can go (usually 115 Kbps)
As slow as it can go
At a speed that matches the modem’s capability
At 56 KBPS

15 . What does the lock DTE modem attribute do?
Protects the modem from being hacked
Prevents the DCE from receiving information from the DTE
Prevents the DTE from receiving information from the DCE
Locks the data speed between the modem and the DTE device

16 . If you wish to add a new entry to the modem capabilities database, which command would you use?
modem cap
modem add
set modem
modem edit

17 . For the DTE to terminate an existing connection, it must:
Drop DTR
Drop CTS
Send ATH to the DCE
Drop CD

18 . What eight pins on a DB25 connector are used to connect a DTE?
2,3,4,5,6,7,8,20
1,2,3,4,5,6,7,8
2,4,5,6,7,8,9,20
2,3,4,5,6,7,9,20

19 . With asynchronous communication, which two of the eight pins in a DB25 connector are used to control the flow of data? Choose
two.
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 20

20 . Which three commands are configured from the line configuration mode?
encapsulation ppp
async mode interactive
modem inout
speed 115200
flowcontrol hardware

21 . On an EIA/TIA-232 null modem cable with DB25 connectors, which two pins are cross- connected?
Pin 2
Pin 3
Pin 4
Pin 5

Pin 7
Pin 8

22 . What occurs when there is no longer a signal on the DTR?
The CD tells the DTE that a DCE-to-DCE connection has been established.
The DTE issues a RTS to the DCE enabling communication.
The DCE terminates its connection with the remote modem.
The DTE applies voltage on pin 20 to alert the DCE that it is connected and available to receive data.

23 . Which signal indicates that the DTE is available to accept a call?
DSR up
RTS up
CTS up
DTR up

24 . What does a modem use to transmit data?
TD
CTS
RTS
RD

25 . Which two statements are true regarding the command “telnet 1.2.3.4 2007”?
Establishes a reverse telnet connection