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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