Which of the following correctly describes ISDN BRI?
(Choose three.)
two 64 kbps B channels and one 16
kbps D channel
B channel is suitable for voice
data
uses in-band signaling
uses out-of-band signaling
offers the equivalent of a T1/E1
connection
twenty-three 64 kbps B channels and
one 16 kbps D channel
2
Which of the following is considered out-of-band
signaling?
using a frequency outside of the
rated bandwidth for transmission
transmitting data over a control
channel
using a separate channel for
control signals
transmitting control signals over a
data channel
3
A network administrator is troubleshooting ISDN
connectivity. The administrator suspects the problem lies with the
authentication protocol. What command should the administrator use
to view the authentication process between the router and the ISDN
switch?
debug pap
authentication
debug chap
authentication
debug ppp
authentication
debug isdn
authentication
4
Which router command would be used to enter the mode
for configuring a T1 PRI connection?
Router(config)# controller t1 {slot/port}
Router(config)# interface pri t1 {slot/port}
Router(config)# interface pri {slot/port} t1
Router(config)# controller {slot/port} t1
5
The network administrator of XYZ company needs to
configure a new ISDN router. After entering the commands shown in
the graphic, the administrator tries to access the Internet but the
ISDN connection does not open. If the service provider verifies that
the problem is with XYZ's configuration, what is a possible cause of
the problem?
The dialer map is configured
incorrectly.
The encapsulation type is
configured incorrectly.
The dialer group is configured
incorrectly.
The ACL is configured
incorrectly.
The isdn switch-type command
needs to be configured globally.
6
Which of the following protocols can be used to
encapsulate data traffic sent from a router BRI interface? (Choose
two.)
Link Access Protocol - Data
High-Level Data Link Control
Logical Link Control
Serial Data Link Control
Point to Point protocol
Binary Synchronous Control
protocol
7
A small company uses an ISDN WAN link to transfer
e-mail to remote sites. What command would the administrator use to
determine if the ISDN link is up?
show isdn status
show isdn active
show dialer
show interface bri0/0
debug isdn
active
8
Which command configures an ISDN interface to use a
switch type which is different from that used on other interfaces on
the router?
Router(config)#switch-type switch-type
Router(config-if)#switch-type switch-type
Router(config)#isdn switch-type switch-type
Router(config-if)#isdn
switch-type switch-type
9
Which of the following is essential for all ISDN BRI
interface configurations?
ISDN switch type
line encoding technique
line framing method
local directory number
service profile
identifier
10
You have just taken delivery of a new US standard
Cisco 2620 router that includes a BRI "U" interface? Which of the
following describes how this router will be connected in the ISDN
network?
An external terminal adapter (TA)
must be attached to the router for connectivity.
An NT1 must be connected to the
router for connectivity.
The router is a TE1 device and is
ready to connect to the provider's network.
The router is a TE2 device and
requires both a TA and NT1 for
connectivity.
11
What must be configured for an ISDN PRI connection?
(Choose three.)
ISDN switch type
Service Profile Identifier
(SPID)
Dial-on-Demand Routing (DDR)
PRI group time slot
T1/E1 controller, framing type and
line coding
12
A network administrator is troubleshooting an ISDN
connectivity problem. Users are complaining they cannot connect to
the Internet. The network administrator suspects the ISDN connection
attempt is timing out before a connection can be established. What
command would the network administrator use to determine what the
"wait for carrier" timeout value is set to?
show isdn status
show isdn active
show dialer
show interfaces bri0/0
debug isdn q931
show ISDN
interfaces
13
What is a reason why static routes are preferred over
dynamic routes for DDR to operate on an ISDN interface?
An ISDN interface will not allow
dynamic routing updates that use broadcast technology.
A dynamic route will take
precedence over a static route because of its lower administrative
distance.
Dynamic routing can never be
considered interesting traffic by default.
Dialer-list configuration does not
support dynamic routing.
Dynamic routes may cause the ISDN
connection to dial constantly to transmit
updates.
14
Which of the following describes the use of a SPID?
(Choose two.)
selects the ISDN switch type
identifies the line configuration
of the BRI service
allows multiple ISDN devices to
share the local loop
designates whether a device is a
TE1 or TE2
allows ISDN
broadcasts
15
Which command is used within an existing ISDN network
to display current call information, including the called
number?
show isdn status
show isdn active
show interfaces bri0/0
show ip
interfaces
16
Which of the following are true of ISDN routers
configured with dialer profiles? (Choose two.)
They do not use ACL to define
interesting traffic.
Their B channels can be configured
with different subnets and encapsulation types.
Their BRI interfaces can belong to
multiple dialer pools.
They use PPP only.
They can only use the CHAP
authentication protocol.
17
A network administrator in Europe has been asked to
provide the network with an ISDN WAN link. The router available to
provide the WAN connection is a non-modular Cisco router with an S/T
interface. What further equipment will be provided by the ISDN
service provider for the ISDN connection?
Nothing. The router is already
suitable.
BRI WAN interface card to install
in the router
an external NT1 to terminate the
local loop
a TA/NT1 device to install on the
router
18
Why must routers be configured to specify the ISDN
switch type?
Switches use various
implementations of Q.931.
The IOS of most routers lacks the
ability to autosense the switch.
The switch must know what type of
router it is communicating with.
The Layer 3 connection between the
terminal equipment and the ISDN switch is not
standardized.
