CISCO SEMESTER 4: MODULE 4

1	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.
2	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

3	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.
4	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

5	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
6	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 ISP 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

7	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
8	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

9	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.
10	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

11	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.
12	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

13	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
14	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.

15	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
16	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
17	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

18	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

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CISCO SEMESTER 4: MODULE 3

How did Cisco alter the HDLC encapsulation to allow a single link to carry multiple protocols?
	split the transmissions into multiple channels each carrying a single protocol
	identified the protocol in the FCS field
	compressed the datagrams differently for each protocol
	added a type field to identify the protocol
A technician has used Telnet to gain remote access to a router that has no connectivity on its serial interface. Which command should be issued to determine if the serial cable is connected properly?
	show controllers
	show processes
	show run
	show status

A two router network is running PPP over the serial interfaces that connect them. The enable password on the Denim router is "gateway". The Denim router also has a locally configured authentication password for the Plaid router which is "fortress". Which command must be executed on the Plaid router to allow Denim to authenticate to the Plaid router using CHAP?
	Plaid(config)# enable secret gateway
	Plaid(config)# enable secret fortress
	Plaid(config)# username Plaid password fortress
	Plaid(config)# username Denim password fortress
	Plaid(config)# hostname Plaid secret password gateway
	Plaid(config)# hostname Plaid secret password fortress

Which authentication protocol can be spoofed to allow playback attacks?
	MD5
	CHAP
	PAP
	NCP

How is the MD5 function valuable in authentication? (Choose two.)
	uses a one-way hash function
	authentication occurs more rapidly
	challenges are unique
	the remote router assumes control of frequency of challenge
	the remote router assumes control of timing of challenge

Which command specifies a link quality over a PPP link?
	ppp link 50
	ppp link quality 60
	ppp percentage 80
	ppp quality 90

Refer to the output of the show interface Serial0/0 command in the graphic. How many NCPs have been established?
	1
	2
	3
	4

Which of the following is an advantage of using time-division multiplexing (TDM) for transmitting data? (Choose two.) It allows a single source to transmit over multiple data channels. Multiple sources can transmit over a single channel. Original data streams must be reconstructed at the destination. TDM relies on Layer 3 protocols to operate.

Which of the following describes the High-Level Data Link Control protocol? (Choose three.)
	HDLC provides flow and error control.
	Standard HDLC supports multiple protocols on a single link.
	HDLC uses sequencing and acknowledgements.
	HDLC is defined as the default encapsulation on Cisco LAN interfaces.
	Cisco implemented a proprietary version of HDLC.

A technician is testing the functionality of a recently installed router. The technician is unable to ping the serial interface of a remote router. The technician executes the show interface serial 0/0 command on the local router and receives the following output: Serial0/0 is up, line protocol is down(disabled) What are possible causes for this command output? (Choose two.)
	interface missing the no shutdown command
	clockrate command missing
	CSU/DSU failed
	interface shutdown due to high error rate
	cable missing

When troubleshooting the Serial 0/0 interface of a router, a technician issues the show controllers command. The following was the output of the command: Interface is Serial0/0, electrical interface is UNKNOWN. What can be concluded about the Serial 0/0 interface? (Choose three.)
	Serial0/0 is down, line protocol is down
	Serial0/0 is down, line protocol is up
	Serial0/0 is up, line protocol is down
	The interface is neither DCE or DTE.
	The interface hardware may be faulty.
	The cabling may be improperly connected.

ISDN BRI service uses two B channels to send data, voice, and video. If the first channel becomes saturated, the second channel can be configured to forward packets. Which command will allow ISDN to load balance across both links? Router(config-if)# ppp quality 2 Router(config-if)# ip variance Router(config-if)# ip maximum-paths 2 Router(config-if)# ppp multilink

Which of the following describe functions of the Point-to-Point protocol with regards to the OSI model? (Choose three.)
	PPP uses Layer 3 of the OSI model to establish and maintain a session between devices.
	PPP operates at all layers of the OSI model.
	PPP uses the data link layer to configure such options as error detection and compression.
	PPP provides a mechanism to multiplex several network layer protocols.
	PPP uses Network Control Protocols (NCP) to test and maintain connectivity between devices.
	PPP can be configured on both synchronous and asynchronous serial interfaces.

PPP uses several protocols for communication. Which of the following are options that the LCP protocol in the PPP architecture can provide? (Choose two.) testing the quality of the link routing packets between devices assigning individual station addresses configuring network layer protocols negotiating authentication options

Several tasks must occur before a link between two routers can pass data using PPP. Which of the following are required to establish and maintain a PPP session between two routers?
	configure each host with a PPP address
	configure authentication between the two routers
	send LCP and NCP frames to negotiate configuration parameters
	send hostname and password information between the two routers

Which of the following is a reason for using such protocols as PAP and CHAP?
	to establish a PPP session
	to provide error checking on a WAN link
	to restrict access to networks connected by serial and ISDN links
	to provide a backup hostname and privilege mode password on the router

Which of the following describes the CHAP protocol? (Choose three.)
	exchanges a random challenge number during the session to verfiy identity
	sends authentication password to verify identity
	prevents transmission of login information in plain text
	disconnects the PPP session if authentication fails
	initiates a two-way handshake

Which command was used to display the partial output shown in the graphic?
	show ppp traffic
	show lcp traffic
	debug ppp negotiation
	debug ppp authentication

What can be concluded from the output shown in the graphic? (Choose three.)
	A two-way handshake is occuring.
	The LCPs were already negotiated.
	The router can begin NCP negotiations.
	The debug ppp negotiation command was executed.
	The debug ppp authentication command was executed.

Which advantage does the multilink option provide when using PPP?
	Data transmission has load balancing possibilities.
	Interfaces can be configured using both HDLC and PPP.
	More than one authentication method can be used.
	More than one compression protocol can be configured.

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