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920-249 Questions and Answers

Answer: A, C

QUESTION: 54

In which two cases is a Virtual Server Router (VSR) used? (Choose two.)

1. situations in which pbind is enabled

2. situations in which all ports are configured with PIPs

3. active-active scenarios in which either switch can process L4 packets destined for the VIP

4. active-standby solutions in which only one switch can process L4 packets destined for the VIP

Answer: C, D

QUESTION: 55

In which two circumstances will a backup switch become the master? (Choose two.)

1. after a successful bid to become the master switch

2. when forced via the /oper/vrrp/master command

3. when it ceases to receive advertisements from the master

4. after receiving an advertisement with a lower priority than its own

Answer: C, D

QUESTION: 56

Which two are enabled by default for a VR? (Choose two.)

1. Sharing

2. Tracking

3. Hot standby

4. Pre-emption

Answer: A, D

QUESTION: 57

Which three are available VRRP tracking parameters? (Choose three.)

1. VRs

   
   

2. ports

3. OSPF

4. VRID

5. HSRP

Answer: A, B, E

QUESTION: 58

Which two are true when sharing is enabled for a Virtual Server Routers (VSR)? (Choose

two.)

1. Client processing takes place on both switches.

2. Server processing takes place on both switches.

3. All client processing is forced to the master switch.

4. Sessions are synchronized between both switches.

Answer: A, B

QUESTION: 59

Which two are symptoms of an unexpected system panic? (Choose two.)

1. The switch resets.

2. The "System Fault" LED blinks.

3. The switch gives you a message when you log on.

4. The switch automatically changes to the "Maintenance" menu when you log on.

Answer: A, C

QUESTION: 60

Which two actions could help with boot problems? (Choose two.)

1. Check the LED patterns.

2. Recalculate Kernel Magic.

3. Boot the FACTORY config block.

4. Select a different software image.

Answer: C, D

QUESTION: 61

Which two techniques are used to troubleshoot a Nortel Application Switch link issue? (Choose two.)

1. Check LED status.

2. Use the /info/sys command.

3. Use the /oper/port command.

4. Use the /info/link command.

Answer: A, D

QUESTION: 62

Which two Ethernet statistics might indicate a speed/duplex mismatch between two link

partners? (Choose two.)

1. frame too long

2. alignment errors

3. excessive collisions

4. internal MAC receive errors

Answer: B, C

QUESTION: 63

Which command causes the switch to dump state information to flash memory and automatically reboot?

1. /maint/dump

2. /maint/panic

3. /maint/tsdmp

4. /maint/ptdmp

Answer: B

QUESTION: 64

Which command displays current switch information, including code version, MAC address and switch model?

1. i/log

2. oper/ip

3. maint/sys

4. /i/sys/general

Answer: D

QUESTION: 65

What are two true reasons for booting the FACTORY configuration block?(Choose two.)

1. The switch image is to be upgraded during boot.

2. The major revision of the boot image is changed.

3. Boot problems are caused by unreadable active/backup configuration blocks.

4. A custom-configured Application Switch is moved to a different environment where it will be reconfigured for a different purpose.

Answer: C, D

QUESTION: 66

Which two command lines are Layer 4 CLI commands? (Choose two.)

1. /cfg/slb/cur

2. /info/arp/dump

3. /stats/port/ <num> <ether/if/link>

4. /stats/slb/real <real-server-number>

Answer: A, D

QUESTION: 67

Where does the Authoritative Name Server (ANS) reside in a Global Server Load Balancing (GSLB) configuration? (Choose two.)

1. at your ISP

2. at the user's ISP

3. no external ANS used for GSLB

4. on the GSLB enabled Application Switch

Answer: C, D

QUESTION: 68

Which two statements apply for a basic Global Server Load Balancing (GSLB) process?

(Choose two.)

1. Sites redirect traffic if all local servers are down.

   
   

2. Sites redirect traffic if all local servers are at max connections.

3. Each GSLB site will return its own VIP in response to DNS queries.

4. Each GSLB site acts as an NIS server for the sub-domain being load balanced.

Answer: A, B

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Nortel Application Switch Rls.23.xConfig and Admin book Nortel leads the way in VoIP functions that support teleworkers | 920-249 Real Questions and VCE Practice Test during this examine we compared the telework offerings of five main IP telephony providers - Alcatel, Avaya, Cisco, Mitel Networks and Nortel - below real-world IP WAN situations. IP telephony is extending new facets and capabilities to cellular employees and highway warriors, and revolutionizing the style teleworkers join and work with their counterparts again within the office. during this verify we in comparison the telework offerings of five leading IP telephony providers beneath real-world IP WAN conditions. We discovered that the seller packages - from Alcatel, Avaya, Cisco, Mitel Networks and Nortel - vary of their protection infrastructure; counseled machine; breadth of latest functions and features; expense; and fine of voice communications. How we did it Archive of community World reports Subscribe to the Product assessment newsletter Kudos to Nortel, the network World Blue Ribbon winner with its MCS 5100 - a new SIP-based IP PBX and purposes platform. Nortel earns high grades for its collaboration elements, together with videoconferencing, fast messaging, whiteboarding and web co-looking. Avaya and Mitel additionally scored well. while neither provided as wealthy an application package as Nortel, Avaya's teleworker kit delivers incredible name routing and mobility elements, whereas Mitel's computer utility protected fabulous call-handling capabilities. We also gave Cisco high marks for its call-routing capabilities. We defined our overview standards in four time-honored areas (see scorecard, below). • Telephony facets and collaboration facets.• complicated mobilephone and soft cellphone efficiency.• Configuration, integration of accessories, setup and monitoring of teleworker connections.• security provisions for shielding the teleworker's IP connections. in this check, each and every dealer first needed to installation a full working IP PBX in our lab. Then they needed to installation anything remote-web page gadget and utility they advocate and present for telecommuters. A Cisco IOS-primarily based router infrastructure linked the enterprise IP PBX LAN with the "remote" teleworker web site, simulating connectivity via one or greater ISPs. a distinct simulation equipment, from PacketStorm, utilized consistent WAN impairments to all passing voice-over-IP (VoIP) site visitors. (See How we did it). function rich What facets rely to a teleworker? We determined anything that enhances productiveness, lessens the physical remoteness of the teleworker, or enables closer communications and collaboration with fellow workers back at the workplace become an outstanding candidate. Nortel's Multimedia computing device client, with an necessary part called the own Agent, addressed all these areas. Presence - where the true-time status of workgroup or department members are propagated to all different contributors - is well implemented and beneficial. different first-class features are call routing, which lets you define quite a lot of name-managing responses in response to elements including who is looking, videoconferencing, instant messaging and whiteboarding. there's even "web-push co-looking," the place dissimilar far off clients can similtaneously browse the same net sites. The Avaya points, included within the $one hundred fifty-per-computing device Mobility kit, encompass a tender phone and routing features that connect and switch calls to the teleworker's cell and residential telephones. there is also IM and a distinct characteristic that integrates phone numbers embedded in net pages with the soft mobile, so you can click on on and dial any telephone quantity you see whereas browsing the net. other well-finished, advantageous points include the six-birthday celebration audioconferencing and integration of the Avaya applications on the laptop with Microsoft Outlook. Mitel's Your Assistant software provides a more-modest function set, however Mitel is continually adding extra to the equipment. We were impressed with the name-routing capabilities; call logs and click-on dialing; dynamic audioconferencing of up to eight parties; and the brief list of shut friends, which allows you to import contacts from Outlook. The application is well prepared, intuitive and customizable. Cisco's elements are disbursed over a number of disparate applications, including the delicate mobilephone and the Cisco very own Assistant. there is additionally access to the seller's unity unified-message save by means of the net interface. unity offers a textual content-to-speech means for retrieving electronic mail with the aid of telephone. Cisco's call routing is among the richest of the entire companies reviewed, featuring the broadest set of rules-based name handling. as an instance, that you would be able to have your calls go to voice mail within the morning after which despatched to your cellphone in the afternoon. there is also a noteworthy own address booklet tied into cell features. Alcatel says it has a couple of new messaging and collaboration applications coming out early next yr. but for now, we confirmed the features of its tender telephone equipment, OmniTouch MyPhone. The software lets the teleworker intently associate his IP gentle telephone with other public switched mobilephone network (PSTN) connections, including cell. An spectacular function is the potential to flow a live call from the IP connection to a PSTN cell if IP name pleasant degrades. VoIP efficiency As lots of the teleworker calls we tested used commonplace vocoders and VPN tunnels, the per-VoIP-call WAN bandwidth consumption became similar throughout the board. as an instance, with the overhead of the VPN tunnel included, a standard G.711 call took about 105K bit/sec in every course. A compressed G.729 name, additionally via a VPN tunnel, took about 46K bit/sec. The exception was Mitel, which does not raise its IP tough mobilephone precise-Time Protocol (RTP) streams in a VPN tunnel. The VoIP connection is authenticated and the RTP streams encrypted, but devoid of the VPN overhead bandwidth drops essentially 20%. call excellent numerous significantly in some situations. Avaya's less-expensive IP phones, the 4602, priced at $195, delivered poor-to-fair call quality with compressed G.729 vocoding. call fine with Avaya model 4620 IP phones, twice the fee of the 4602, consistently yielded first rate calls. Avaya says both cell fashions put in force vocoding algorithms in a different way, which is not typically the case with VoIP items from the identical seller. The soft-cell name nice become generally worse than with tough telephones. The mediocre headset we used for all our tender mobilephone calls little doubt contributed to this outcomes, however we advise readers to accept as true with providing their teleworkers the choice of an IP hard cell, too, in spite of the fact that they might use a smooth cell. Nortel had the most beneficial tender-phone call excellent, with decent-to-surprising ratings for both G.729 and G.711. Avaya's turned into good to striking with G.729, but best reasonable with G.711, which was impressive. Alcatel's soft cell yielded fair-to-first rate name high-quality with G.711 and negative-to-fair for G.729. Cisco's smooth-cell call pleasant turned into poor with G.729, but fair with G.711. Mitel presents a tender telephone for teleworkers, however wanted us to check with just its IP hard telephone at the teleworker web site. IP tough-mobilephone call nice, in most cases, became respectable to staggering. In Mitel's case, we rated IP tough mobilephone name high-quality as good with G.711, however perceptibly stronger, good to dazzling, with G.729. Nortel's hard phones yielded good-to-mind-blowing call first-class in all instances, as did Cisco's. Teleworking through tunnels We required providers to install the security infrastructure they recommend to customers who should support teleworkers. IP protection (IPSec)-based mostly VPN tunnels were the alternative in all instances. Mitel used VPN tunnels best for computing device connections; the VoIP streams of its IP hard cell didn't commute through VPN tunnels. Cisco and Avaya deployed VPN client bins on the telecommuter website. These devices - a mannequin 831 IOS-based cozy Router in Cisco's case and SG5X secure Gateway in Avaya's case - consist of a multi-port swap, function encryption and authentication for a couple of concurrent VPN tunnels, in addition to community handle translation, Dynamic Host Configuration Protocol, IP routing and, to a consumer-defined extent, firewall processing. Alcatel recommends IPSec-based mostly VPN tunnels, however does not present its own VPN gadget. as a substitute, Alcatel certifies that its VoIP equipment and OmniPCX will work over certain third-birthday party VPN programs. since the vendor failed to deliver any VPN apparatus, we tried a low-conclusion Linksys IPSec-primarily based kit under Alcatel's teleworker VoIP connection. The Linksys VPN apparatus wasn't on Alcatel's listing of licensed VPN hardware, nevertheless it labored fine. In Mitel's case, a area of expertise Linux-based server on the enterprise community, called the 6010 Teleworker answer, handles all protection and compression (G.729 vocoder) processing for as much as 500 teleworker connections. a laptop at the teleworker web page runs the teleworker purposes and connects via a VPN tunnel the use of the native Microsoft VPN client software, which sets up a extra-or-much less IPSec-primarily based Layer 2 Tunneling Protocol relaxed VPN tunnel. Mitel's IP difficult phone sets up an authenticated and encrypted connection from the teleworker to the 6010 server. It isn't a VPN tunnel, even though, so it avoids the delivered bandwidth consumed via VPN overhead. With its decrease bandwidth and generally better VoIP voice satisfactory - as most effective its IP challenging telephones were validated - Mitel garnered a excessive efficiency score. Nortel's notebook utility is multifaceted and well engineered. Nortel's VPN client utility, which comes free as a component of its Contivity VPN hardware kit, handles all safety processing for each the computing device with gentle telephone and an not obligatory, attached IP challenging telephone, in place of having a VPN container tackle it. moreover the smooth mobilephone, Nortel's computer software equipment, called the Multimedia computer client v2.0, also includes the smarts to deal with SIP endpoint call processing. So all there's at the Nortel telecommuter website is the computer - working all of Nortel's customer software and smooth cell. If now not plugged into the WAN hyperlink (via cable or DSL modem, and many others.), the computer can be plugged into the change port of the not obligatory IP tough mobilephone. In either case, all site visitors between the teleworker website and the enterprise network is included during the Contivity VPN tunnel. The programs verified might all efficaciously deploy their safety and teleworker VoIP connections over the Cisco router infrastructure. Configuration concerns in the configuration category we considered the difficult and smooth mobilephone alternate options, the mixing of the components, and the setup and monitoring of teleworker connections. while there became some variety, ordinary we rated all of the vendors on the equal stage during this category. We did not verify Alcatel's teleworker configuration with a hard cell, but the dealer does support a tough cell and delicate phone aggregate. Alcatel's ranking here became compensated by astonishing setup wizards for its tender cellphone, which assures top of the line sound and voice quality. The capability to tune Avaya's gentle telephone for optimizing name exceptional is additionally noteworthy. The administrator and the teleworker can conveniently modify vocoders, even adjust get hold of and transmit gain (quantity) levels. Avaya, too, lets the teleworker closely affiliate the IP tender mobilephone with an IP complicated telephone, home mobile or cell. The teleworker can retrieve some rudimentary precise-time pleasant-of-provider (QoS) records from the tender mobilephone, too. Cisco these days revamped its soft phone constitution, going from the outdated TAPI-based mostly utility to new code that directly interacts by means of the Cisco "skinny" call-manage protocol, formally referred to as SCCP. Some alterations are certainly still necessary, as a result of Cisco's soft mobilephone name quality wants work. Cisco's IP challenging mobilephone efficiency remains stellar, however. Cisco's wealth of safety alternatives, and its bandwidth management and QoS elements are extra huge than its IP-telephony competitors. but all that functionality leaves clients with a lot of items to manage and various interfaces during which to do it. Nortel's smartly-structured pc application includes the video coder/decoder, and the bandwidth required for the video element turned into in the latitude of 40K to 80K bit/sec. With the very respectable soft-mobile call satisfactory, an IP tough telephone at a teleworker web site can be useless, although it nonetheless offers improved connection fine. Mitel failed to supply its gentle telephone for this evaluate, but the dealer does present a edition of its Your Assistant utility that comprises a delicate telephone. A plus for Mitel in this category is its Teleworker community Analyzer, a small home windows application designed to be e-mailed to teleworkers from the administrator. The applet effectively installs, launches a simulated VoIP session lower back to headquarters and then shows all QoS and connection details. Conclusion The main IP-PBX providers all have a narrative to tell for extending VoIP out to teleworkers. however their on-web page teleworker applications vary considerably in machine and configuration, function, price and relative name best. delicate-telephone name best became most beneficial with Nortel, adopted via Avaya, Alcatel and Cisco. IP tough cell call high-quality generally became more suitable and extra constant throughout the board, al-though there have been considerable transformations with both vocoders we established and between Avaya's diverse IP-challenging telephone models. Avaya and Cisco, choose a multi-port VPN container on the teleworker web page, while Nortel and Mitel employed workstation-based VPN customer software in our trying out. in any other case, the entire vendors endorse and support IPSec-based VPN tunnels for securing teleworker-to-headquarters VoIP connections. 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