Cisco Exam #642-821: BCRAN Exam (Transcender, set 1)
Brush up on your knowledge of WAN connection technologies for remote access between enterprise sites for the CCNP exam with these 10 sample questions.
courtesy of Transcender
Question:
1. Which WAN connection type supports both Frame Relay and X.25 connections?
a. BRI
b. Synchronous serial
c. Asynchronous serial
d. Channelized T1 or E1
2. What is the function of dialer rotary groups in a dial-on-demand routing (DDR) configuration?
a. They allow a single logical interface connection to be applied to a single physical interface.
b. They allow a single physical interface connection to be applied to a single logical interface.
c. They allow a single physical interface connection to be applied to a set of logical interfaces.
d. They allow a single logical interface connection to be applied to a set of physical interfaces.
3. In regard to Frame Relay traffic shaping, which term refers to a message sent from the Frame Relay switch to the source router informing the router that the network is congested?
a. FECN
b. BECN
c. Committed Information Rate (CIR)
d. Discard Eligibility (DE) Indicator
4. You have configured the following custom queue list for your Cisco 3640 router:
Router(config)# queue-list 2 protocol ip 1 udp 69
Router(config)# queue-list 2 protocol ip 2
Router(config)# queue-list 2 protocol appletalk 3
Router(config)# queue-list 2 protocol ipx 4
Router(config)# queue-list 2 default 5
Router(config)# queue-list 2 queue 1 byte-count 4500
Router(config)# queue-list 2 queue 2 byte-count 3000
!
Router(config)# interface serial 0
Router(config)# custom-queue-list 2
What does the following command specify?
Router(config)# queue-list 2 queue 1 byte-count 4500
a. All traffic will be transferred at 4,500 bytes.
b. All IP traffic will be transferred at 4,500 bytes.
c. All IPX traffic will be transferred at 4,500 bytes.
d. All IP traffic to port 69 will be transferred at 4,500 bytes.
e. All AppleTalk traffic will be transferred at 4,500 bytes.
5. You have two main offices, one in Miami and the other in Atlanta. There is a Frame Relay connection and an ISDN connection between the offices. You have configured the ISDN connection to become active when the Frame Relay connection is overloaded, and you want load sharing to occur when both connections are active. The Frame Relay connection uses the S0 interface on both routers, and the ISDN connection uses the Bri0 interface on both routers. The routers use the IGRP routing protocol to route packets. The Frame Relay connection is five times faster than the ISDN connection.
Which command or commands will allow you to load share and balance the traffic so the primary connection has five times more traffic on it than the backup connection?
a. Router(config)# router igrp 100
b. Router(config)# variance 5
Router(config)# traffic-share balanced
c. Router(config)# router igrp 100
Router(config)# variance 5
Router(config)# traffic-share balanced
d. Router(config)# router igrp 100
Router(config-router)# variance 5
Router(config-router)# traffic-share balanced
6. You must display the configured IKE policies for your VPN. Which command should you use to display these policies?
a. show crypto map
b. debug crypto ipsec
c. show crypto ipsec sa
d. show crypto isakmp policy
e. show crypto ipsec transform-set
7. Which WAN encapsulation protocol transmits data in 53-byte cells?
8. What is the base TCP port for individual lines that use Reverse Telnet?
9. Which modem AT command restores the modem configuration to factory defaults?
10. Which NAT function conserves inside global addresses by translating source ports in TCP or UDP connections?
1. Answer B is correct. Synchronous serial interfaces on Cisco routers support Frame Relay and X.25 leased line connections.
Asynchronous serial connections support asynchronous dial-up connections where a modem is used to establish the connection.
BRI connections support ISDN BRI connections.
2. Answer D is correct. Dialer rotary groups allow a single logical interface connection to be applied to a set of physical interfaces. They are useful when an environment has multiple calling destinations, and are defined by specifying the dialer interface.
3. Answer B is correct. A backward explicit congestion notification (BECN) is a message sent from the Frame Relay switch to the source router informing it that the network is congested.
A forward explicit congestion notification (FECN) is a message sent from the Frame Relay switch to the destination device informing it that the network is congested.
The committed information rate (CIR) is the rate at which the Frame Relay switch agrees to transmit data. It is measured in bits per second.
The Discard Eligibility (DE) Indicator verifies that the packet has the DE bit set so the switch can drop these packets first if network congestion occurs.
4. Answer D is correct. The command queue-list 2 queue 1 byte-count 4500 specifies that queue #1, which was configured above, will have a threshold of 4,500 bytes instead of the default 1,500 bytes. Therefore, since port 69 under UDP is the TFTP application, it will be dispatched until the threshold of 3,000 bytes is met or exceeded. At that time, the router will move to queue 2.
All IP traffic will be transmitted at 3,000 bytes.
All other traffic will be transferred at 1,500 bytes.
5. Answer D is correct. The proper commands are:
Router(config)# router igrp 100
Router(config-router)# variance 5
Router(config-router)# traffic-share balanced
The variance command indicates that the primary connection is five times faster than the backup connection. The traffic-share balanced command when the variance command is used indicates that the balance will be accomplished by transmitting five times the amount of traffic over the primary connection than over the backup connection.
6. Answer D is correct. The show crypto isakmp policy command displays the configured IKE (Internet Key Exchange) policies. Output from this command includes the encryption and hash algorithm, authentication method, Diffie-Hellman group, and lifetime.
The show crypto map command displays your configured crypto maps.
The debug crypto ipsec command displays the IPSec traffic that is traversing the Cisco IOS.
The show crypto ipsec sa command displays the current state of the IPSec SAs (Security Associations).
The show crypto ipsec transform-set command displays the current configured transform sets.
7. ATM
8. 2000
9. AT&F
10. overloading inside global addresses
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