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Exam : Acme Packet AP0-001
Title : Configuration and Administration Basics

1. 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

2. 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

3. __________ is/are stored in SDRAM.
A. Licensing information
B. Boot parameters
C. Passwords
D. Logs
Answer: D

4. What sip-config option will limit the number of routes that the Net-Net 4000 attempts after prioritizing all local policies for a new inbound SIP call?
A. max-routes
B. route-limit
C. next-hops
D. hop-limit
Answer: A

5. You configure the _____________and _____________elements to use the Net-Net 4000 to perform load balancing between two downstream SIP proxies.
A. realmsteering pool
B. local policysession agent group
C. session routersession router group
D. proxyproxy pool
Answer: B

6. 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

7. 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

8. 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

9. 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
B. slots
C. IP addresses
D. Realms
Answer: A

10. 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

11. 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

12. 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

13. 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

14. 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

15. 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

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. 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

18. 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

19. 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

20. 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 and is referred to as a dialog.
Answer: AB

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