Testking Nortel 920-804
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Exam Number/Code:920-804
Exam Name: Nortel technology standards and protocols for converged networks
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Given the following network information:
1. The call server located at the corporate office is accessible directly through the LAN by local
employees.
2. Remote office are able to access the corporate server through a managed Internet service Provider
(ISP)
3. The corporate network and all endpoint have firewalls that limit access. Only ports 22 and 443 allow
traffic traversal for the servers.
4. The firewalls are provided and managed by the ISP and their contract is exclusive for the next three
years.
5. The firewalls are NOT stateful and do NOT understand the complexities of SIPorH.323.However, the
ISP will NOT replace them without a significant charge to the customer.
Which two solutions can the company implement to enable VoIP traffic to securely traverse the network?
(Choose two.)
A. Configure SIP-proxy servers on the network to intercept and propagate the VoIP traffic through the
ISP-managed firewalls.
B. Install Virtual Private Network (VPN) devices at the remote locations. These can intercept and encapsulate
VoIP traffic going to and from the call server with tunneling using port 443.
C. Implement VPN devices at all locations with split tunneling configured to tunnel VoIP traffic with QoS to
the call server. This moves the VoIP traffic from the Internet and only makes it accessible on the intranet. The
ISP will need to be asked to allow the VPN tunnel traffic.
D. Recommend that the customer purchase their own SIP/H.323-Capable firewalls fro the opposite ends of all
the managed connections. The firewalls need to be placed in front of the ISP-owned firewalls and firewall ports
need to be opened to permit VoIP traffic.
Answer: B C
QUESTION 2:
Certkiller .com has recently migrated their network from a dedicated Frame Relay (FR) WAN to
managed full-mesh IP Security Protocols (IPSec) Virtual Private Network (VPN). Given the following
network information:
1. All of the branch offices are now connected to the main data center and to each other through the
full-mesh IPSec-VPN.
2. For branch offices with 50 to 100 users and data connection to the managed IPSec-VPN is provided via
a cable modem at a rate of 2 Mbps.
3. The branch offices with 10 to 50 users also use cable modems but with bandwidths of 1 Mbps to the
managed IPSec-VPN.
4. The individual home-office users are provided with synchronous Digital Subscriber Line (DSL)
connections that are 256 kbps, that are tunneled to the managed IPSec-VPN using a Customer Provided
Equipment (CPE) based IPSec-VPN device.
5. Other than the individual home-office users, the traffic leaving the branch office locations is NOT
encrypted until it leaves the local networks and enters the IPSec-VPN at the Internet Service Provider
(ISP) backbone.
VoIPsystem tests find that there is significant jitter on the home-office users’ VoIP calls when they
attempt to download e-mail at the same time. Which two network issues are the most plausible causes of
the VoIP traffic issue? (Choose two.)
A. The IPSec-VPNs do NOT have QoS to manage the VoIP calls.
B. Delays introduced by the e-mail server cause the VoIP traffic to be queued until the e-mail transfer starts to
send out a smooth flow of data.
C. Circuit bandwidths speeds are greater than the speed at which the IPSec-VPN devices can encrypt and
decrypt, resulting in additional delay and jitter in the VoIP communications.
D. The processor on the CPE that is terminating the IPSec-VPN can only handle the processing of the VoIP call
or the e-mal transfer while encrypting either into the IPSec-VPN tunnel.
E. VoIP is more difficult to secure in an IPSec-VPN than typical IP traffic, thus the IPSec-VPN device is taxed
with the additional processing, which slows the transmitting of the VoIP payload.
Answer: A C
QUESTION 3:
Given the following network information:
1. All remote users are restricted to 56 kbps dial-up access to the company network.
2. The Layer 1 connections between the campus buildings consist of T3/E3 circuits to their local Internet
Service Provider (ISP), which routes their Layer 3 information to the Internet
3. The IP Security Protocols (IPSec) Virtual Private Network (VPN) tunnels are currently exceeding the
bandwidth of the circuits between the VPN tunnel and points.
4. The VoIP calls that are being completed between campus buildings are noticeably degrading during
hours of peak bandwidth usage.
5. All intra- and inter-office communications are using the G.711 CODEC between the Internet
Telephones and the VoIP call servers.
6. All VoIP calls made by the remote users are using the G.729 CODES.
7. During random times of the day, the IP-VPN tunnel are NOT using the full bandwidth of the T3/E3
circuits, but latency across the tunnels between campus buildings is excessive (>=150 milliseconds.)
Which three recommendations should you make to prevent the degradation of VoIP traffic as it traverses
the IPSec-VPN tunnels along with all other traffic? (Choose three.)
A. Add an IP-VPN device at each campus building to handle additional inter-office traffic.
B. Recommend a configuration that forces remote users to use L2TP tunnels to access the network.
C. Recommend a managed backbone other than the Internet for inter-office traffic, such as Asynchronous
Transfer Mode (ATM) or Frame Relay (FR).
D. Verify that al remote users have their Internet Telephones configured with the G.711 CODEC.
E. Verify that all remote users have their Internet Telephones configured with the G.711 CODEC.
F. Recommend IP-VPN termination for remote client PCs on the Internet (aggressive mode) with DiffServ and
QoS.
Answer: A B C
QUESTION 4:
Exhibit:
What is the 911/112 situation depicted in the exhibit?
A. The Public Service Answering Point (PSAP) which receives the 911/112 call would dispatch the Emergency
Medical Technician (EMT) to the wrong location.
B. The Central Office (CO) which receives the 911/112 call would forward it to dispatch who would then call
the local number sent to ascertain the location of the caller.
C. The Automatic Number Identification (ANI) information for the 911/112 call would identify the caller’s
name and station identifier to the PSAP. The EMT would ask for that locations at the security office.
D. The Calling Line Identification (CLID) information for the 911/112 call would identify the caller’s name and
station identifier to the PSAP. The EMT would ask for that location at the security office.
Answer: A
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