17. Which protocol should be chosen to support WAN connectivity in a multi-vendor system and provide strong security through authentication?
NAT with DHCP
Frame Relay
HDLC with encryption
HDLC with CHAP
PPP with PAP
PPP with CHAP
18. Which of the following are valid steps for a basic ISDN BRI configuration? (Choose two.)
create subinterfaces
define the LMI type
set the SPIDs if required by the ISDN switch
set the interface DLCI
set the switch type
specify the encapsulation as either Cisco or IETF
19. A branch office reports excessive connect time charges for an ISDN circuit used to connect to the regional office. Upon investigation of this issue, it is discovered that when an ISDN connection is initiated to the regional office it remains connected for an excessive amount of time. Which of the following configuration changes could be made to DDR on the router to reduce these connect time charges?
use PPP multilink
lower idle timer setting
use CHAP authentication
change DDR from legacy to dialer profiles
20. A network administrator is having difficulty in establishing a serial link between a Cisco router and a router from another vendor. Both routers are configured for HDLC encapsulation. Which statements are true regarding this configuration? (Choose two.)
The Cisco HDLC frame uses a proprietary "Type" field that may not be compatible with equipment of other vendors.
HDLC requires a clock rate to be configured on the routers at both ends of the serial link.
PPP encapsulation is recommended for serial links between equipment from multiple vendors.
Usernames must be configured at both ends of the HDLC serial link.
The HDLC vendor type must be enabled on the Cisco router.
There is a mismatch in the HDLC authentication password configurations.
21. Given the partial router configuration in the graphic, why does the workstation with the IP address 192.168.1.153/28 fail to access the Internet? (Choose two.)
The NAT inside interfaces are not configured properly.
The NAT outside interface is not configured properly.
The router is not properly configured to use the access control list for NAT.
The NAT pool is not properly configured to use routable outside addresses.
The access control list does not include the IP address 192.168.1.153/28 to access the Internet.
22. The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue will prevent IP traffic from crossing this link?
The passwords must be different for the CHAP authentication.
The usernames are misconfigured.
The clock rate must be 56000.
The clock rate is configured on the wrong end of the link.
The IP addresses must be on the same subnet.
Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.
23. What causes a DDR call to be placed?
dial string
DLCI
idle time out
interesting traffic
PVC
24. Which two layers of the OSI model are described by WAN standards?
Application Layer, Physical Layer
Data Link Layer, Physical Layer
Data Link Layer, Transport Layer
Physical Layer, Network Layer
25. A technician is testing RouterA in the graphic. What is the condition of the circuit?
The routers are configured for different encapsulations.
The clock rate is not properly configured on the routers.
The circuit from WAN provider has failed.
Authentication is not properly configured on the routers.
The circuit is functioning properly.
26. A network administrator must provide WAN connectivity between a central office and three remote sites: Orlando, Atlanta, and Phoenix. The Orlando and Atlanta remote offices receive sales orders and transmit shipping confirmations to the Central office consistently throughout the day. The Phoenix remote office consists of one salesperson traveling through the southwest territory. The salesperson occasionally needs to connect to the Central office for e-mail access. How should the network administrator connect the remote sites to the Central office? (Choose two.)
Connect to the Atlanta and Orlando remote offices with Frame Relay connections.
Connect to the Atlanta and Orlando remote offices with ISDN connections.
Connect to the Atlanta and Orlando remote offices with POTS dial-up connections.
Connect to the Phoenix remote office with a Frame Relay connection.
Connect to the Phoenix remote office with a POTS dial-up connection.
27. When a Frame Relay switch detects an excessive buildup of frames in its queue, which of the following may occur? (Choose two.)
Frames with the DE bit set are dropped from the switch queue.
Frames with the FECN and BECN bits set are dropped from the switch queue.
Frames in excess of the CIR are not accepted by the switch.
The switch sets the FECN bit on all frames it places on the congested link and sets the BECN bit on all frames it receives on the congested link.
The switch sets the FECN bit on all frames it receives on the congested link and sets the BECN bit on all frames it places on the congested link.
28. A system administrator is troubleshooting a connectivity issue between two routers in a new installation. The administrator enters the debug ppp authentication command on the WHSE router. The graphic shows a part of the output received. From this output, what is the most likely cause of this connectivity issue?
There is not a route to the remote router.
The ISDN circuit on the remote router has failed.
The username/password was not properly configured on the WHSE router.
The remote router has a different authentication protocol configured.
29. What does the output of the show frame-relay map command shown below represent? (Choose two.)
Serial 0 (up): ip 172.30.151.4 dlci 122, dynamic, broadcast, status defined, active
172.30.151.4 represents the IP address of the remote router.
172.30.151.4 represents the IP address of the local serial interface.
DLCI 122 represents the interface of the remote router.
broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets across this PVC.
dynamic indicates that a dynamic routing protocol is enabled for this connection.
active indicates that the ARP process is working.
30. What does the status inactive indicate in the output of the show frame-relay pvc command?
The DLCI is programmed in the switch but is not usable.
The DLCI was formerly programmed in the switch but is no longer there.
The DLCI is usable but has little activity.
The DLCI has been renamed for that PVC.
NAT with DHCP
Frame Relay
HDLC with encryption
HDLC with CHAP
PPP with PAP
PPP with CHAP
18. Which of the following are valid steps for a basic ISDN BRI configuration? (Choose two.)
create subinterfaces
define the LMI type
set the SPIDs if required by the ISDN switch
set the interface DLCI
set the switch type
specify the encapsulation as either Cisco or IETF
19. A branch office reports excessive connect time charges for an ISDN circuit used to connect to the regional office. Upon investigation of this issue, it is discovered that when an ISDN connection is initiated to the regional office it remains connected for an excessive amount of time. Which of the following configuration changes could be made to DDR on the router to reduce these connect time charges?
use PPP multilink
lower idle timer setting
use CHAP authentication
change DDR from legacy to dialer profiles
20. A network administrator is having difficulty in establishing a serial link between a Cisco router and a router from another vendor. Both routers are configured for HDLC encapsulation. Which statements are true regarding this configuration? (Choose two.)
The Cisco HDLC frame uses a proprietary "Type" field that may not be compatible with equipment of other vendors.
HDLC requires a clock rate to be configured on the routers at both ends of the serial link.
PPP encapsulation is recommended for serial links between equipment from multiple vendors.
Usernames must be configured at both ends of the HDLC serial link.
The HDLC vendor type must be enabled on the Cisco router.
There is a mismatch in the HDLC authentication password configurations.
21. Given the partial router configuration in the graphic, why does the workstation with the IP address 192.168.1.153/28 fail to access the Internet? (Choose two.)
The NAT inside interfaces are not configured properly.
The NAT outside interface is not configured properly.
The router is not properly configured to use the access control list for NAT.
The NAT pool is not properly configured to use routable outside addresses.
The access control list does not include the IP address 192.168.1.153/28 to access the Internet.
22. The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue will prevent IP traffic from crossing this link?
The passwords must be different for the CHAP authentication.
The usernames are misconfigured.
The clock rate must be 56000.
The clock rate is configured on the wrong end of the link.
The IP addresses must be on the same subnet.
Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.
23. What causes a DDR call to be placed?
dial string
DLCI
idle time out
interesting traffic
PVC
24. Which two layers of the OSI model are described by WAN standards?
Application Layer, Physical Layer
Data Link Layer, Physical Layer
Data Link Layer, Transport Layer
Physical Layer, Network Layer
25. A technician is testing RouterA in the graphic. What is the condition of the circuit?
The routers are configured for different encapsulations.
The clock rate is not properly configured on the routers.
The circuit from WAN provider has failed.
Authentication is not properly configured on the routers.
The circuit is functioning properly.
26. A network administrator must provide WAN connectivity between a central office and three remote sites: Orlando, Atlanta, and Phoenix. The Orlando and Atlanta remote offices receive sales orders and transmit shipping confirmations to the Central office consistently throughout the day. The Phoenix remote office consists of one salesperson traveling through the southwest territory. The salesperson occasionally needs to connect to the Central office for e-mail access. How should the network administrator connect the remote sites to the Central office? (Choose two.)
Connect to the Atlanta and Orlando remote offices with Frame Relay connections.
Connect to the Atlanta and Orlando remote offices with ISDN connections.
Connect to the Atlanta and Orlando remote offices with POTS dial-up connections.
Connect to the Phoenix remote office with a Frame Relay connection.
Connect to the Phoenix remote office with a POTS dial-up connection.
27. When a Frame Relay switch detects an excessive buildup of frames in its queue, which of the following may occur? (Choose two.)
Frames with the DE bit set are dropped from the switch queue.
Frames with the FECN and BECN bits set are dropped from the switch queue.
Frames in excess of the CIR are not accepted by the switch.
The switch sets the FECN bit on all frames it places on the congested link and sets the BECN bit on all frames it receives on the congested link.
The switch sets the FECN bit on all frames it receives on the congested link and sets the BECN bit on all frames it places on the congested link.
28. A system administrator is troubleshooting a connectivity issue between two routers in a new installation. The administrator enters the debug ppp authentication command on the WHSE router. The graphic shows a part of the output received. From this output, what is the most likely cause of this connectivity issue?
There is not a route to the remote router.
The ISDN circuit on the remote router has failed.
The username/password was not properly configured on the WHSE router.
The remote router has a different authentication protocol configured.
29. What does the output of the show frame-relay map command shown below represent? (Choose two.)
Serial 0 (up): ip 172.30.151.4 dlci 122, dynamic, broadcast, status defined, active
172.30.151.4 represents the IP address of the remote router.
172.30.151.4 represents the IP address of the local serial interface.
DLCI 122 represents the interface of the remote router.
broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets across this PVC.
dynamic indicates that a dynamic routing protocol is enabled for this connection.
active indicates that the ARP process is working.
30. What does the status inactive indicate in the output of the show frame-relay pvc command?
The DLCI is programmed in the switch but is not usable.
The DLCI was formerly programmed in the switch but is no longer there.
The DLCI is usable but has little activity.
The DLCI has been renamed for that PVC.
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