Configuration and Administration Basics

• Exam Number/Code : AP0-001
• Exam Name : Configuration and Administration Basics
• Questions and Answers : 105 Q&As

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1. When configuring the allow-anonymous parameter in the SIP port element, a value of __________ may
be configured to allow access only from user agents who have previously registered through the Net-Net
4000 or who are configured as session agents.
A. registered
B. agents-only
C. realm-prefix
D. prev-registered
Answer: A
2. If upon examination of two configuration files you notice that the version number of the permanently
saved configuration differs from the version number of the running configuration, it means that
__________.
A. the saved configuration file has been edited, but the done command was not issued
B. the saved configuration file has been copied from flash into SDRAM using the save-config command
C. the saved configuration file has been saved into flash, but the activate-config command has not been
issued
D. the saved configuration file was copied from flash into SDRAM using the activate-config command
Answer: C
3. Of the following configured local policy preferences that the Net-Net 4000 sorts through, which one of the
four preference discriminators listed below would be ranked the second highest priority?
A. codec
B. lowest cost
C. next hop
D. realm
Answer: A
4. Steering pools are realm specific, and by limiting the number of __________ provide constraints on the
number of concurrent RTP sessions allowed on the Net-Net 4000.
A. UDP ports
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B. slots
C. IP addresses
D. Realms
Answer: A
5. __________ is/are stored in SDRAM.
A. Licensing information
B. Boot parameters
C. Passwords
D. Logs
Answer: D
6. Which one of the following statements about SIP is FALSE?
A. The Via header field indicates the transport used for the transaction.
B. The Contact header field provides a SIP or SIPS URI that can be used to contact that specific instance of
the UA for subsequent requests.
C. A SIP transaction consists of a single request and any responses to that request, which include zero or
more provisional responses and one or more final responses.
D. A dialog is identified at each UA with a dialog ID, which consists of a Call-ID value, a Contact and a
Request URI.
Answer: D
7. When SIP sessions are terminated and re-originated as they flow through the Net-Net 4000, the
____________ is rewritten to force all session related media to be routed through Net-Net 4000.
A. Via
B. From
C. SDP
D. Contact
Answer: C
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8. Which one of the four statements below about Session Initiation Protocol (SIP) is FALSE?
A. SIP provides for resource reservation.
B. SIP works with both IPv4 and IPv6.
C. SIP can run on top of either UDP or TCP as the transport protocol.
D. SIP can be used to invite participants to an already existing session.
Answer: A
9. In this scenario, the User Agents (UAs) are both SIP-enabled phones. What is the correct order of this
basic SIP message flow?
1)The UAC initiates the session with an INVITE.
2)The UAS sends a 200 OK message indicating that the request has succeeded.
3)Media is exchanged bidirectionally.
4)The UAS sends a 100 Trying response back to the UAC
5)The UAC sends a BYE message. This is followed by a 200 OK final response message sent by the
UAS.
6)The UAS sends a 180 Ringing message.
7)The UAC sends an ACK message confirming that it has received a final response to INVITE.
A. 1,2,4,6,7,5,3
B. 1,4,6,2,7,3,5
C. 1,7,4,6,3,2,5
D. 1,4,2,7,6,3,5
Answer: B
10. Which two of the following statements regarding SIP processing are FALSE?
A. An initial INVITE will contain a From header tag and a To header tag as a globally unique identifier for the
dialog.
B. To avoid retransmissions, User Agents must forward received 100 Trying messages to their next hop.
C. Calls Per Second are typically measured using a 7-10 message SIP call flow including call set-up and
tear down.
D. The combination of the To tag, From tag, and Call-ID completely defines a peer-to-peer SIP relationship
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and is referred to as a dialog.
Answer: AB
11. A(n) __________ is an association between a globally unique SIP or SIPS URI and the user agents
contact address. This association is written by the registrar server to a database where it can be used by
a proxy in the local domain.
A. location record
B. AOR
C. binding
D. public address
Answer: C
12. SIP is an Application layer control protocol that performs which two of the following functions?
A. Establishment, modification and termination of multimedia sessions.
B. Provides resource reservation for multimedia sessions.
C. Supports redirection services.
D. Describes the supported media attributes for the session.
Answer: Ac
13. Which one of the following statements about the SIP-NAT is TRUE?
A. The Net-Net 4000 uses the SIP-NAT element to rewrite the contact-URI, the Via header and the SDP.
B. The Net-Net 4000 uses the SIP-NAT to provide translation between a home address space and an
external address space.
C. The Net-Net 4000 uses the SIP-NAT to act as a service pipe to SIPD.
D. You must have at least one SIP-NAT to route traffic between realms.
Answer: B
14. You configure the _____________and _____________elements to use the Net-Net 4000 to perform
load balancing between two downstream SIP proxies.
A. realmsteering pool
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B. local policysession agent group
C. session routersession router group
D. proxyproxy pool
Answer: B
15. Using the command show redundancy sipd, redundancy statistics and transactions are displayed.
Which 3 of the following statistics provide information about the state of SIP signaling checkpointing?
A. CPU Utilization
B. Error responses
C. Retransmissions sent
D. Duplicate requests
Answer: BCD
16. When the Adaptive Hosted NAT Traversal feature is enabled, the Net-Net 4000 will ______________.
A. send PING messages to dynamically learn the binding time of a endpoint behind a NAT device
B. send OPTIONS methods at a defined incrementing period to dynamically see if an endpoint behind a
NAT device is still reachable
C. create bindings for the Addresses of Record of endpoints that are not behind a NAT
D. create bindings for the Addresses of Record of endpoints that are behind a NAT
Answer: B
17. What sip-config option will suppress the inclusion of a registration cache cookie in the Contact header of
messages forwarded?
A. reg-mode=no cache
B. reg-cache-mode=none
C. reg-mode=none
D. reg-cache-mode=no cache
Answer: B
18. What sip-config option will limit the number of routes that the Net-Net 4000 attempts after prioritizing all
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local policies for a new inbound SIP call?
A. max-routes
B. route-limit
C. next-hops
D. hop-limit
Answer: A
19. How does the Net-Net 4000 ensure that the pinholes are kept open for persistent communication to SIP
endpoints behind a NAT device?
A. By sending OPTIONS messages at a defined frequency
B. By sending ARP requests at a defined frequency
C. By changing the expires= parameter to a defined value in 200 OK responses to REGISTERs
D. By changing the expires= parameter to a defined value in 200 OK responses to INVITEs
Answer: C
20. When the nat-traversal parameter is set to always the Net-Net 4000 compares the
__________________ and the Layer-3 source address to determine whether the endpoint is behind a NAT
device and further compares the __________________ to the Layer-3 source address to determine
whether to add the registration to its registration cache.
A. sent-by of the top most Via headerhost address of the Contact URI
B. sent-by of the bottom most Via headerhost address of the Contact URl
C. From addresshost address of the Contact URI
D. host address of the Contact URIFrom address
Answer: A
21. The Net-Net 4000 will release media between SIP endpoints that are located in the same realm when
the ____________parameter is set to____________.
A. msm-networkdisabled
B. mm-in-realmdisabled
C. mm-in-networkenabled
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D. mm-in-realmenabled
Answer: B
22. When configuring the Net-Net 4000, __________ SIP interface(s) is/are allowed per realm, and
__________ SIP port(s) is/are allowed for a SIP interface.
A. multiplemultiple
B. 11024
C. multiple999
D. 1multiple
Answer: D
23. Examine below the output from the show sipd invite command.
Of the 600 Busy Everywhere messages sent by the Net-Net 4000, how many in the last 140 seconds did
not originate from a downstream device?
A. 4
B. 161
C. 13
D. 0
Answer: D
24. Which one of the following statements about the show sipd endpoint-ip command is
FALSE.
A. This command shows registration expiration timer values per endpoint.
B. The data for the output of this command is gleaned from the registration cache.
C. This command will only output data for endpoints located behind a NAT.
D. This command will not accept wildcards.
Answer: C
25. When configuring the SIP interface for a realm, the __________ field indicates how often a User Agent
(UA) located behind a NAT should reREGISTER with the Net-Net 4000.
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A. nat-interval
B. nat-traversal
C. registration-interval
D. nat-mode
Answer: A
26. The ____________feature instructs the Net-Net 4000 whether to locally store all bindings for endpoints
not located behind a NAT.
A. Registration caching
B. Reverse latching
C. Adaptive NAT traversal
D. Hairpinning
Answer: A
27. Which one of the following statements about H.323 networks is FALSE?
A. The collection of all terminals, gateways, and MCUs managed by a single gatekeeper is known as an
Autonomous System (AS).
B. Gateways are not mandatory in an H.323 network.
C. Gatekeepers are not mandatory in an H.323 network.
D. Gateways translate call set-up messages and convert media formats.
Answer: A
28. In an H.323 network, a __________ provides translation services and communication between
dissimilar networks.
A. gatekeeper
B. gateway
C. multipoint control unit
D. codec
Answer: B

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