1Z

Transcription

1 1Z0-400 Passing Score: 800 Time Limit: 0 min

2 Exam A QUESTION 1 Which two Net-Net 4500 Realm Bridging models are valid in a SIP environment? A. SIP-NAT Bridge (SNB) B. Multiple SIP-NATs Hosted in a Home Realm (MSNHHR) C. Open System Interconnect (OSI) D. Header Manipulation for SIP-NAT Realms (HMSNR) E. Single SIP NAT Homed in a Trusted Network (SSNHTN) Correct Answer: BE QUESTION 2 On a Net-Net 4500, a hardware-based timer will reset the system in the event of a catastrophic software or operating system failure. This hardware timer is reset (preventing it from triggering) by the. A. Acme Control Protocol Daemon B. Border Element Redundancy Protocol Daemon (BERPD) C. Console-timeout/telnet-timeout configuration in system-config D. System clock E. Watchdog process Correct Answer: E

3 QUESTION 3 Which two are TRUE regarding the Net-Net 3820 and Net-Net 4500 Fan Module component? A. User-serviceable B. Self-cleaning C. Hot-swappable D. Redundant E. Liquid cooled Correct Answer: BE QUESTION 4 In a peering environment based on SIP-NAT Bridge, which two elements must be configured to accommodate signaling and media? A. Physical Interface B. Network Interface C. SIP Manipulation Rule D. RTP Table E. Local Policy Correct Answer: BC QUESTION 5 Upon issuing the done command, you get an Error 409. What does this error indicate? A. The element you are creating is corrupted. B. The element you are trying to save does not exist.

4 C. You are trying to create an element with a unique identifier that already exists. D. There is an internal server error. E. You are trying to create a second instance of a single-instance configuration object. Correct Answer: C QUESTION 6 A session agent group (SAG) allows for the creation of a logical grouping of session agents. Which two options are valid for the "strategy" parameter in the session-group to route traffic? A. propdist B. lowsusrate C. mostbusy D. lastused E. mostfree Correct Answer: AD QUESTION 7 Which SIP header does the Session Border Controller check when looking for a match to the "to address" in the local-policy? A. Request-URI B. Top most Via header C. Route header D. To header E. Call-ID header Correct Answer: A

5 : Reference: QUESTION 8 When working in the Session Border Controller's OS environment, which is FALSE? A. Every IP address referenced in a SIP configuration object must be defined as an IP address in the corresponding network-interface object B. IP addresses defined in steering pools do not need to be defined as part of the network-interface configuration object. C. An IP address to enable telnet to a network-interface must be defined appropriately in the corresponding network-interface object. D. The local-address of an h323-stack does not need to be defined in the corresponding network-interface object. E. The local-address of an MGCP gateway IP does not need to be defined in the corresponding network-interface object. Correct Answer: A : Reference: QUESTION 9 High availability (HA) nodes identify one another by their names. A. Identifier B. Host C. Mib-system-name D. Target E. Wancom0 name Correct Answer: D

6 QUESTION 10 You must decide whether to deploy the policy based realm bridging with header manipulation rules (PBRB-HMR) model in your SIP peering environment. What are two deciding factors that tip your decision for or against HMR in contrast to a SIP-NAT Bridge (SNB) architecture? A. PBRB-HMR has lower performance overhead than SIP-NAT Bridge. B. PBRB-HMR is much easier to configure, even though it has similar performance to the SNB model. C. PBRB-HMR is recommended for both peering and access architectures. D. SNB is the simplest model to troubleshoot. E. PBRB-HMR provides better topology hiding, at the expense of performance. Correct Answer: BE : Reference: QUESTION 11 You are logged into the Session Border Controller as superuser.you want to remove other users from the system. What telnet command is available to remove other users? A. Kill <index number> B. Kill <task-id> C. Remove user <index number> D. Remove user <username> E. Remove users Correct Answer: C

7 QUESTION 12 To replace the Session Border Controller's running configuration with a previous configuration, perform the following: A. Use the exec last-known-good-config command. B. Use the restore-backup-config command. C. Use the restore-backup-config command, followed by save and activate. D. Use the activate-config command. E. Use display-backups, identify the configuration name and associated number, then issue the run-backup <number> command. Correct Answer: C QUESTION 13 Once the management network interface is configured, what can it be used for? A. Maintenance activities and Application log retrieval B. Software upgrades and System configuration C. Telnet, SSH, SNMP, FTP, and SFTP connections D. RADIUS CDR transmission E. All of the above Correct Answer: B QUESTION 14 What needs to be done to enable Physical Interface Redundancy (phy link redundancy)?

8 A. Set link-redundancy-state to enabled in the system-config. B. Set link-redundancy to enabled in the system-config. C. Set link-redundancy-state to enabled in the network-interface. D. Set link-redundancy to enabled in the network-interface. E. Run the superuser command enable phy-redundancy. Correct Answer: C QUESTION 15 Session Initiation Protocol (SIP) is an Application layer control protocol that performs which two functions? A. Establish, modify and terminate multimedia sessions. B. Reserve resources for multimedia sessions. C. Provide network transport services for real-time applications such as voice and video. D. Describe the supported media attributes for the session. E. Support redirection services. Correct Answer: AC : Reference: QUESTION 16 The parameter in the sip-interface element indicates how often a User Agent (UA) located behind a NAT should re-register with the Session Border Controller. A. nat-interval B. nat-traversal C. registration-interval D. nat-mode

9 E. min-reg-expire Correct Answer: B QUESTION 17 You are enabling management access on a network interface in the Session Border Controller. Which two are applicable? A. add-snmp-ip B. snmp-address C. add-hip-ip D. telnet-port E. set-hip Correct Answer: BD QUESTION 18 What are two differences between the SIP NAT Bridge (SNB) and the Single SIP NAT Homed in a Trusted Network (SSNHTN) models on the Session Border Controller? A. In a SIP-NAT Bridge (SNB), multiple access and backbone realms are allowed. In the SSNHTN model, only one backbone realm is allowed. B. In the SSNHTN model, the home proxy address (HPA)is set to , as the HPA is only needed in SNB architectures. C. In the SSNHTN model, the home proxy address(hpa) is set to point to sipd.

10 D. In the SSNHTN model, the home address and home proxy address (HPA) are addressed from a range that is in the backbone realm. E. Where is no distinguishable difference between the two models. Correct Answer: AC QUESTION 19 You mape a configuration change to a media interface. Which command must be executed in order to commit the changes to volatile memory? A. save-config B. commit-config C. activate-config D. write-config E. done Correct Answer: C QUESTION 20 To view an existing multiple-instance element's configuration you can go to the correct branch of the configuration tree and. A. Typeis -a. B. Enter the name of the element and then issue the show command. C. Type show?and select from the displayed list. D. Type show <element name>. E. Select the element and then issue the show command. Correct Answer: D

11 QUESTION 21 Which two parameters are NOT phy-interface parameters? A. sub-port-id B. hostname C. name D. operation-type E. speed Correct Answer: BE QUESTION 22 Which statements are TRUE about a Net-Net 4500 SIP interface? A. The SIP interface provides G.711 to G.729 transcoding functions ONLY when SIP is the signaling protocol. B. The SIP interface listens for SIP signaling on one or more configured IP address/port/transport combinations. C. You can only configure a single SIP port per realm. D. The SIP interface provides a service pipe to sipd, such that incoming signaling messages are presented to the SIP protocol daemon for processing. E. The SIP interface modifies headers, such as the TO and FROM, to provide topology hiding. Correct Answer: B QUESTION 23 All of the following are components of the Session Border Controller's OS Media Control function, except:

12 A. Quality of Service (QoS) Marking B. DTMF extraction (RFC2833) C. Dynamic Access Control D. Conferencing/Multipoint Control Unit (MTU) mixing E. Media supervision timers/call teardown Correct Answer: E : Reference: QUESTION 24 Which statement is FALSE about the sub-port-id field within a network-interface configuration? A. The value assigned to a sub-port-id field within a network-interface configuration element is globally unique within a Net-Net 4500's running configuration. B. The sub-port-id field has a range of C. The sub-port-id represents a VLAN tag value. D. The sub-port-id allows for multiple network-interface configuration elements to be bound to a single physical interface. E. Along with a network-interface configuration element's "name" field, comprises the primary key for the element. Correct Answer: D QUESTION 25 is the percentage of a Session Border Controller's peer advertisement time for the other peer in the high availability (HA) pair to wait before considering the peer out of service. A. 2 B. Percent-drift C. 3.1 D. Standard-deviation-score

13 E. State-field Correct Answer: B QUESTION 26 Which two SIP request Methods are defined by RFC 3261? A. SETUP B. RINGING C. TRYING D. CANCEL E. OPTIONS Correct Answer: AE QUESTION 27 The h245-stage parameter in the h323-stack element determines. A. The stage at which the Net-Net 4500 will start tunneling H.245 messages B. The point in the call where H.245 messages are allowed after the call has been connected C. The stage at which the Net-Net 4500 will indicate that a separate H.245 connection must be opened D. The point at which H.245 will appear on the TCP/IP stack E. That two associated h323-stacks have a gatekeeper field defined Correct Answer: C

14 QUESTION 28 Which two parameters MUST be specified when configuring a local policy for SIP peering? A. Source-realm(s) B. Next-hop C. Sip-interface D. Ingress-policy element and egress-policy element E. Home realm Correct Answer: BD QUESTION 29 You are working with a Net-Net 4500 Session Border Controller.What will result from the execution of the delete-configuration command? A. Deletion of all configuration files stored in the /code/gzconfig directory. B. Both the "saved" and "running" configuration numbers are incremented by 1. C. Automatic reboot of the operating system. D. Deletion of non-system default licenses. E. Deletion of the bootparameters: "target name" field. Correct Answer: C

15 QUESTION 30 How does the Session Border Controller ensure that a pinhole is kept open for persistent communication to a SIP endpoint behind a NAT device? A. By sending messages at a defined frequency B. By sending ARP requests at a defined frequency C. By issuing PINGs to the endpoint's NAT address D. By changing the expires= parameter to a defined value in 200 OK responses to INVITEs E. By changing the expires= parameter to a defined value in 200 OK responses to REGISTERS Correct Answer: B QUESTION 31 You configured local policy preferences on the Net-Net 4500.The Net-Net 4500 sorts through these preferences. Which preference is ranked the second highest priority? A. Codec B. Lowest cost C. Next hop D. Realm E. Protocol Correct Answer: E QUESTION 32 You want the Session Border Controller to detect that an endpoint is behind a NAT/firewall device.what value do you set for the nat-traversal parameter? A. Always

16 B. Never C. Enabled D. Disabled E. Detect Correct Answer: C QUESTION 33 In high availability (HA) architectures, requests from the standby node result in information about state changes being pulled by the standby Session Border Controller (SBC) from the active SBC.Two checkpointed states include: A. Alarm state B. Media state C. Signaling state D. Dormant state E. Admin state Correct Answer: BC QUESTION 34 In a high availability (HA) pair, a network administrator could trigger a system switchover manually from the Session Border Controller by issuing the notify berpd force command. A. Standby or Active B. Active only C. Standby only D. Active node that no longer has a heartbeat E. Secondary only

17 Correct Answer: D QUESTION 35 Which is NOT part of the Net-Net 4500's front panel: A. Power and status LEDs B. A pinhole for issuing reset C. A flip-down door covering two PCMCIA slots D. A fan pack with removable and cleanable fan filter E. A USB port for local storage Correct Answer: C QUESTION 36 Which header fields will a User Agent Client (UAC) use to communicate the SIP extensions, or options, it expects the corresponding User Agent Server (UAS) to support? A. Require: B. Supported: C. Subject: D. Capability: E. Features: Correct Answer: B

18 QUESTION 37 Which option tag is used for reliability of provisional responses in SIP messages? A. 100rel B. Prack C. Rel D. Supported E. Required Correct Answer: A QUESTION 38 What two options are available to enable access control in a SIP configuration and how would they be configured? A. Configure the allow-anonymous parameter to source-realm. B. Configure the al low-anonymous parameter under the sip-port to realm-prefix and configure an ingress realm addr-prefix to an address that is not C. Configure the al low-anonymous parameter under the sip-port to agents-only, then configure your SIP peers as session agents. D. Configure a steering-pool with a smaller subnet than the realm-prefix. E. Configure the access-control parameter to realm-prefix. Correct Answer: CE QUESTION 39

19 How many VLANs per physical interface are supported on a Session Border Controller? A. Either 3,820 or 4,500, depending on your model B C D E Correct Answer: E QUESTION 40 Which two statements about realms are TRUE? A. You must have a minimum of three realms in any configuration, one of which must be designated as the home realm. B. All endpoints within a realm must reside within the same subnet as the Net-Net C. Although you can use both TCP and UDP concurrently as the transport protocol, you can only have one SIP-interface per realm. D. You can associate multiple realms with a single network interface. E. You can associate multiple network interfaces with a single realm. Correct Answer: AE QUESTION 41 Which two Net-Net 4500 Realm Bridging models are valid in a SIP environment? A. Single SIP-NAT Hosted in a Private Network (SSHPN) B. Single SIP-NAT Homed in an Access Network (SSNHAN) C. Multiple SIP-NATs Homed in an Access Network (MSMHAN) D. Policy-Based Realm Bridging with Header Manipulation Rules (PBRB-HMR) E. Policy-Based SIP-Realm-NAT (PBSRN)

20 Correct Answer: BD QUESTION 42 Which two configuration objects are NOT required to enable SIP signaling to traverse the Session Border Controller? A. steering-pool B. media-manager C. realm-config D. network-interface E. sip-interface Correct Answer: AD QUESTION 43 Which two statements about the Session Initiation Protocol (SIP) are TRUE? A. In SIP, the CSeq is incremented for each new transaction, except ACK, from a user agent within a dialog. B. SIP uses the Session Description Protocol to identify media details for the call being set up. C. A SIP ACK is used to acknowledge receipt of each message sent during call setup. D. SIP uses HTTP to send response codes, such as 403 Unavailable messages. E. SIP messages are formatted in MIME/64 hex format. Correct Answer: BE

21 QUESTION 44 A steering pool defines. A. A range of IP addresses used to route media flows as they egress the box. B. A range of IP addresses and a pool of ports Net-Net 4500 will use to declare itself as the destination for all subsequent media flows in a dialog. C. An IP address and range of ports the Net-Net 4500 will use to declare itself as the destination for media flows in a session. D. An IP address and port the Net-Net 4500 uses for steering media to the external media server. E. A range of ports used to route media flows as they egress the Net-Net Correct Answer: E QUESTION 45 The Net-Net 4500 will release media between non-nated SIP endpoints that are located in the same realm when the parameter is set to. A. msm-network; disabled B. mm-in-realm; disabled C. mm-in-network; enabled D. mm-in-realm; enabled E. mm-in-network; disabled Correct Answer: D QUESTION 46 What establishes, modifies and removes CAM entries for packet forwarding? A. Middle box Control Daemon (MBCD) B. Acme Control Protocol (ACP)

22 C. Session Initiation Protocol Daemon (SIPD) D. Acme Packet Session Descriptor (APSD) E. Content Addressable Memory Daemon (CAMD) Correct Answer: C