642-821 (BCRAN®) TestKing's Building Cisco® Remote Access Networks Version 1.0


Here is the procedure to get the latest version:

1. Go to www.testking.com
2. Click on Member zone/Log in
3. The latest versions of all purchased products are downloadable from here. Just click the links.

For most updates, it is enough just to print the new questions at the end of the new version, not the whole
document.

Feedback
Feedback on specific questions should be send to You should state: Exam number and
version, question number, and login ID.

Our experts will answer your mail promptly.

Copyright
Each pdf file contains a unique serial number associated with your particular name and contact information for
security purposes. So if we find out that a particular pdf file is being distributed by you, TestKing reserves the
right to take legal action against you according to the International Copyright Laws.
642 - 821 Leading the way in IT testing and certification tools, www.testking.com

- 3 -

QUESTION NO: 1
A bank needs to connect a branch office to the corporate network on the other side of town.
The branch office has twelve users that require constant access to the bank’s central accounting system

B. Multi-mode service
C. Asynchronous service
D. High-Speed Serial (HSS) interface Answer: C
Explanation:
An asynchronous dial-up solution using the existing telephony network and an analog modem is often the
solution for telecommuters because it is easy and the telephone facilities are already installed.

642 - 821 Leading the way in IT testing and certification tools, www.testking.com

- 4 -

Reference: Building Cisco Remote Access Networks (Ciscopress) page 31 QUESTION NO: 3
What are the advantages of Frame Relay connection over dedicated leased lines? (Choose two)

A. Better suited multiple branch locations.
B. Lower cost.
C. More control over the connection.
D. Full guaranteed bandwidth. Answer: B, C

642 - 821 Leading the way in IT testing and certification tools, www.testking.com

- 5 - QUESTION NO: 5
Which WAN connections are typically employed at telecommuter sites? (Choose three)

A. Asynchronous dial-up
B. ISDN BRI
C. Leased lines
D. HDSL
E. Cable modems
F. ADSL Answer: A B F
Explanation:
Typical WAN connections employed at telecommuter sites are as follows:
• Asynchronous dial-up
• ISDN BRI
• Frame Relay (leased line)
Reference: Building Cisco Remote Access Networks (Ciscopress) page 31 QUESTION NO: 6
Which statement describes the differences between IPSec and Cisco Encryption Technology (CET)?

B. Traffic between the headend and the supplier antenna.
C. Broadcast traffic, including the cable TV signals.
D. Traffic from outside the local cable segment serving the user’s home. Answer: A
Explanation:
In the upstream direction (subscriber cable modems transmitting towards the head-end) the environment is
many transmitters and one receiver. This introduces the need for precise scheduling of packet transmissions to
achieve high utilization and precise power control so as to not overdrive the receiver or other amplifier
electronics in the cable system. Since the upstream direction is like a single receiver with many antennas, the
channels are much much more susceptible to inter-fering noise products [5, 6] . In the cable industry, we
generally call this ingress noise.
..00000000000000
Reference:
/>7c.html QUESTION NO: 8
Which feature will cache routes learned by dynamic routing protocols, enabling their use over DDR
connections?

A. Route redistribution
B. Dynamic static routes
C. Snapshot routing
D. DDR route maps
E. Passive interfaces Answer: A

(5,488 meters) over a single copper twisted pair.

Reference:
QUESTION NO: 10
Which statement is true regarding uninteresting traffic being carried over a DDR link?

A. Uninteresting traffic will keep DDR call established, even if no more interesting traffic is being routed
over the link.
B. Uninteresting traffic will be routed over an established DDR call, but at a lower priority than interesting
traffic.
C. Uninteresting traffic will not be routed over an established DDR call.
D. Uninteresting traffic will be routed over an established DDR call, as long as there is enough interesting
traffic to keep the call connected. Answer: C
Explanation:
Packets that are permitted entry according to the access list are identified as interesting or packets of interest.
Packets that are not permitted entry or are denied entry by an access list are deemed uninteresting.

Reference:
/>87504.html 642 - 821

Answer:
642 - 821 Leading the way in IT testing and certification tools, www.testking.com

- 9 -
Explanation:
• Custom queuing – reserves a certain percentage of bandwidth for each specified class of traffic.
• Weighted fair queuing – prioritizes interactive traffics over file transfers to ensure satisfactory
response time for common user applications.
• Basic queuing – No such thing
• Priority queuing – ensures the timely delivery of a specific protocol or type of traffic because
that traffic is transmitted before all others.

Reference: Building Cisco Remote Access Networks (Ciscopress) page 399
QUESTION NO: 13
Under which circumstance would use of Kerberos authentication system be required, instead of
TACACS+ or RADIUS?

A. Authentication, authorization and accounting need to use the a single database.
B. Multiple level of authorization need to be applied to various router commands.
C. DES encrypted authentication is required.

A. Mainframe computer
B. CSU/DSU
C. Router
D. Terminal
E. Modem Answer: A C D
Explanation:
Data terminal equipment (DTE) are end devices such as PCs, workstations, routers, and mainframe computers.

Reference: Building Cisco Remote Access Networks (Ciscopress) page 57
QUESTION NO: 15
When the following configuration is present on the router, how many addresses will be available for
dynamic nat translation?
ip nat pool test 192.168.1.33 192.168.1.42 netmask 255.255.255.224 ip nat inside source list 7 pool test

A. 7
B. 9
C. 10
D. 31 Answer: C
Explanation
The IP address that is configured for dynamic nat translation is 192.168.1.33 19 192.168.1.42 netmask
255.255.255.224


Reference: Building Cisco Remote Access Networks (Ciscopress) page 23 QUESTION NO: 17
Which six AAA accounting types will a TACACS+/RADIUS server record?

A. Network, interface, exec, protocol, system, and resource
B. Resource, interface, connection, system, command, and network
C. Command, system, exec, network, connection, and resource
D. Connection, protocol, system, network, command, and resource
E. Crypto, system, network, protocol, command, and resource Answer: C
Explanation:
system - Enables accounting for all system-level events not associated with users, such as reloads
network - Enables accounting for all network-related requests, including SLIP, PPP, PPP network control
protocols, and ARAP
connection - Enables accounting for outbound Telnet and rlogin
exec - Enables accounting for EXEC processes (user shells)
command - level Enables accounting for all commands at the specified privilege level
642 - 821 Leading the way in IT testing and certification tools, www.testking.com

- 12 -
A. Digital cable
B. T1 leased line
C. ISDN
D. Asynchronous dial-in
E. 56K dedicated line Answer: C, D
Explanation:
642 - 821 Leading the way in IT testing and certification tools, www.testking.com

- 13 -

Circuit switching is a WAN-switching method, in which a dedicated physical circuit through a carrier network
is established, maintained and terminated for each communication session. Initial signal at the setup stage
determines the endpoints and the connection between the two endpoints.
Typical circuit switched connections are as follows:
• Asynchronous serial
• Integrated Service Digital Network (ISDN), Basic Rate Interface (BRI), and ISDN Primary rate
Interface (PRI)

Reference: Building Cisco Remote Access Networks (Ciscopress) page 20 21
QUESTION NO: 20
Which three are responsible of IKE in the IPSec protocol? (Choose three)
QUESTION NO: 21
642 - 821 Leading the way in IT testing and certification tools, www.testking.com

- 14 -

Frame Relay describes the interconnection process between which two types of equipment?

A. DTE and DTE
B. DCE and DCE
C. CPE and DTE
D. CPE and DCE Answer: D
Explanation:
Frame relay defines the interconnection process between your customer premises equipment (CPE- also known
as data terminal equipment [DTE]) such as a router, and the service provider’s local access-switching
equipment (known as data communications equipment [DCE]).

Reference: Building Cisco Remote Access Networks (Ciscopress) page 340
QUESTION NO: 22
Drag and drop the ISDN in the options column to the related term in the target column.
Answer: B
Explanation:
VPNs enables today’s increasingly mobile workforce to connect to their corporate intranets or extranets
whenever, wherever, or however they require; improving productivity and flexibility while reducing access
costs.
Reference: Building Cisco Remote Access Networks (Ciscopress) page 561
QUESTION NO: 24