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Test Code : 920-533
Test title : Carrier VoIP - Communication Server 2000 - Compact
Vendor title : Nortel
real questions : 33 real Questions

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Carrier VoIP - Communication Server 2000 - Compact exam

community Simulator 2: a Simulation device for Linux | 920-533 real Questions and VCE rehearse Test

The ARIES (advanced analysis on information superhighway E-Servers) assignment begun in 2000 as a Part of the Open systems Lab research actions at the Ericsson company Unit of research. in the beginning, the mission aimed to ascertain and prototype the quintessential know-how to prove the feasibility of an online server that had the guaranteed availability, response time and scalability the usage of Linux and open-source application. The undertaking become a success, and it persisted in 2001 to focal point on improving the clustering capabilities of Linux to breathe the working gear of alternative for the mobile cyber web servers. Many enhancements gain been added within the areas of load balancing, traffic distribution and protection, moreover IPv6 guide.

One enjoyable question that got here up became what's the gain an impact on of supporting IPv6 on other protocols used by means of different functions on their Linux clusters? To reply this question, they begun a study investigating the consequences of IPv6 capitalize on different protocols, comparable to SCTP. Part of the analyze is to perceive at various applications in SCTP over IPv6. besides the fact that children, they did not gain the time and supplies to install a lab with distinct nodes and applications that exercise SCTP over IPv6. instead, they selected the subsequent premier solution, community simulation.

there is a growing to breathe recognition within different information superhighway communities of the import of simulation tools that assist design and test new cyber web protocols. New features and protocols existing challenges for testing. as an example, exceptional of provider and multicast start require massive and complicated environments. Protocol designers respect the benefits of simulation when computing elements are not obtainable or are too high priced to replica a honest lab setup. With simulation, that you would breathe able to enact significant-scale exams which are managed and reproducible. This was precisely what they essential to construct their case scenarios; the search started primarily for an open-supply device because most of their travail pursuits the deployment of open-supply software in response to Linux.

Our target utility is a true-time community simulation appliance that they will exercise to outline the different eventualities. a very Interesting open-source device they got here throughout became community Simulator 2 (NS2), which was developed with the aid of the information Sciences Institute at the university of Southern California.

in this article, they summarize the artery to deploy and configure NS2 and consider two different simulation situations. the primary status of affairs contains monitoring SCTP site visitors between two nodes, and the second scenario looks at the conduct of internet site visitors and net applications over TCP over a six-node network.

The device: community Simulator 2

NS2 is an open-source simulation device that runs on Linux. it is a discreet suffer simulator targeted at networking research and gives massive aid for simulation of routing, multicast protocols and IP protocols, comparable to UDP, TCP, RTP and SRM over wired and instant (native and satellite) networks. It has many advantages that get it a useful gizmo, equivalent to guide for multiple protocols and the capability of graphically detailing network site visitors. additionally, NS2 helps a few algorithms in routing and queuing. LAN routing and announces are a Part of routing algorithms. Queuing algorithms involve reasonable queuing, deficit circular-robin and FIFO.

NS2 complete started as a variant of the actual network simulator in 1989 (see supplies). precise is a network simulator originally putative for researching the dynamic conduct of stream and congestion ply schemes in packet-switched statistics networks.

presently NS2 progress by VINT neighborhood is supported through protection advanced research initiatives company (DARPA) with SAMAN and thru NSF with CONSER, each in collaboration with different researchers together with ACIRI (see resources). NS2 is attainable on a yoke of structures equivalent to FreeBSD, Linux, SunOS and Solaris. NS2 additionally builds and runs beneath windows.

standard eventualities should noiseless Run on any budget friendly desktop; however, very gigantic scenarios improvement from vast quantities of reminiscence. additionally, NS2 requires the following applications to run: Tcl unlock eight.three.2, Tk unencumber 8.3.2, OTcl unencumber 1.0a7 and TclCL unencumber 1.0b11.

installation and Configuration

The procedure of setting up NS2 is simple yet prolonged. at the time of writing, the most contemporaneous edition turned into 2.1b8. They are interested in the "all-in-one" kit because it contains the source code that they want to patch in SCTP guide.

you could download the all-in-one kit from the NS2 home web page (see materials) into /usr/src and extract it as follows:

cd /usr/src tar xzvf ns-allinone-2.1b8.tar.gz cd ns-allinone-2.1b8

as a result of they need to examine a case status of affairs involving SCTP, they deserve to result the SCTP patch to NS2 from the institution of Delaware. The patch is purchasable for the NS2 all-in-one 2.1b8 version and might breathe downloaded from the Protocol Engineering Lab domestic web page (see resources). With the Linux patch utility, which you can supplant the NS2 supply code to encompass capitalize for SCTP through applying the patch:

patch -p0 < ns-allinone-2.1b8.sctp-rel2.2_patch_orig

within the equal listing, there's a script named deploy in an trouble to configure, compile and install the necessary and non-compulsory NS2 add-ons. There is not any interplay with the user while setting up; the script is completely automated. You gain to execute the script as superuser so that setting up of binaries could breathe achieved:

./set up

When the installation process is comprehensive, here message will issue on your shell

Please put $CUR_PATH/bin:$CUR_PATH/tcl$TCLVER/unix:$CUR_PATH/ tk$TKVER/unix into your path atmosphere; so thatyou'll breathe able to Run itm/tclsh/desire/xgraph. important NOTICES: [...]

carefully comply with complete instructions given within the notices. The above-outlined variables will likewise breathe up-to-date either by editing /and so on/profile or altering atmosphere variables without delay. in the event you up to date /and so on/profile, you deserve to source your new atmosphere for the changes to bewitch consequence (i.e., supply /and so forth/profile).

The NS2 validation suite will check that complete protocols are functional. this can fail if the deploy system became now not completed; although, working validation is non-compulsory, and it consumes twice as plenty time because the compilation and installation technique.

To Run the validation suite:

cd ./ns-2.1b8 ./validate

the exercise of NS2 to monitor SCTP site visitors

SCTP is a transmission protocol that turned into brought by means of the IETF workgroup SIGTRAN in October 2000 (RFC 2960) to enable SS7 site visitors over IP. youngsters, considering the fact that then it has adopted many more makes exercise of because of its versatility as it additionally helps multihoming, community congestion handle, error-free sequenced birth and many other options.

After applying the SCTP patch to NS2 kit, a README file is created: /usr/src/ns-allinone-2.1b8/ns-2.1b8/sctp.README. at the wait of the sctp.README file, there is an instance script for an SCTP interplay. in the simulation generated by means of this Tcl script, you'll bewitch a perceive at SCTP's 4-way handshake as described in RFC 2960, as well as congestion handle. This status of affairs examines FTP site visitors over SCTP between two nodes: node 0 is FTP customer and node 1 is FTP server.

The original script is complicated coded for edition 2.1b7a. You should update few lines to reflect your personal setup. list 1 has been updated assuming that NS2 edition 2.1b8 became installed.

checklist 1. SCTP Simulation Script

The adjustments that gain been utilized to the customary script are definitely environment the paths depending on the inescapable environment. once you update the paths of complete used tools, you're able to delivery NS2 for a network simulation of SCTP. To delivery the simulation, result these steps:

cd /usr/src/ns-allinone-2.1b8 ns ./sctp.tcl

figure 1. SCTP statistics Profile

determine 2. Simulation Window

On execution, three windows will appear. the first window is represented via determine 1 showing a graph with packet site visitors. The 2d window indicates the simulation window as viewed in figure 2. The third window is the control window of the community animator (NAM).

it is entertaining to discern the graph generated by NS2 (figure 1). The yellow x represents a dropped packet and horizontally to the perquisite is the retransmission. This dropped packet took set because of an oversight loss model that became brought into the script that without problems drops the targeted packets between nodes given. SCTP manages retransmission similarly to TCP, supporting speedy retransmit.

set err [new ErrorModel/List] $err droplist 15 $ns lossmodel $err $n0 $n1

in the simulation window (figure 2), arrogate click on on the link between each nodes and select graph --> graph bandwidth, and then click on link 0-->1; you are going to acquire a bar graph representing bandwidth going from node 0 to node 1. you can iterate this procedure for transpose site visitors bandwidth to video pomp traffic going from node 1 to node 0. Now, breathe confident you discern site visitors bandwidth graphs beneath node pomp (determine 3).

figure three. traffic Bandwidth Utility Graphs

earlier than they genesis the scenario, they are able to bewitch a quick analyze some vital strains in the script and define what they do:

[...] // After initializing hint // information and simulation home windows set n0 [$ns node] // two nodes are created set n1 [$ns node] // (n0 and n1) $ns duplex-link $n0 $n1 .5Mb 300ms DropTail // then they are linked // together $ns duplex-hyperlink-op $n0 $n1 orient appropriate [...] set sctp0 [new Agent/SCTP] $ns connect-agent $n0 $sctp0 [...] set sctp1 [new Agent/SCTP] $ns attach-agent $n1 $sctp1

Then they outline the protocol (SCTP) that may breathe used for vacation spot and revert traffic. An agent, defining what protocol to use, is akin to a service for packets. each and every agent ought to breathe attached to a specific node:

$ns connect $sctp0 $sctp1 // connect each agents // together to set up // a communications // channel, or a move [...] set ftp0 [new Application/FTP] // define the category of // utility that // will exercise the // movement, FTP $ftp0 attach-agent $sctp0

To birth precise-time simulation, press the play forward button. the primary event to word is the four packets that stir the FTP connection. This corresponds to the stream initiation habits specified in RFC 2960. The other suffer to celebrate is congestion manage. SCTP will ship few packets at a time and continuously augment until it reaches a highest throughput however will now not flood the network. however they don't alter their network's bandwidth, the FTP connection between nodes 0 and 1 indicates some fundamental congestion control. The genesis and conclusion of the FTP connection are defined on these lines:

$ns at 0.5 "$ftp0 beginning" $ns at 4.5 "$ftp0 stop"

note how the packets are being despatched in an increasing style, or visually, in longer formats. in reality, the packets are at complete times the identical size; although, the variety of packets acquired by means of the server is extended as can breathe viewed via the number of SACKS obtained through client (figure 4). SACKS are sent to well known every packet acquired to breathe confident packet validation and reliability.

figure 4. SACKS for every SCTP Packet despatched

The college of Delaware didn't enforce multihoming of their SCTP patch to NS2. This capability that SCTP behaves in a similar vogue to TCP when it involves streams. otherwise, packets may well breathe viewed traveling both alongside the fundamental path and alongside an extra routing direction to the server's 2nd, third or different IP tackle. a similar habits is dynamic rerouting, which is a secondary feature of SCTP's fundamental path monitoring.

using NS2 to pomp screen internet site visitors over TCP

This status of affairs examines web site visitors over a TCP network. To simulate this case, they defined six nodes:

  • node 0 is the customer so as to request an internet web page from the internet server.

  • node 1 is the customer's router.

  • node 2 is the internet cache's primary router.

  • node three is the net cache's secondary router.

  • node four is the internet cache server.

  • node 5 is the net server.

  • The net cache (node four) is linked to a web server (node 5) through a router (node 3). The net client (node 0) is linked to web cache (node 4) with connection routed through the customer's router (node 1). To simulate this case status of affairs, you want the script proven in list 2.

    checklist 2. TCP Script

    When executing ns ./tcpweb.tcl, you're going to attain two windows: the network animator and the simulation window. figure 5 indicates a probable design of the nodes in simulation window. To regain an accurate photograph of site visitors from customer, bandwidth graphs for the link between nodes 1 and 2 are displayed.

    figure 5. Dynamic Rerouting of Packets

    link failure happens between nodes 2 and four (determine 5) as defined by means of the following strains:

    $ns rtmodel-at three down $lrmon3 $lmcrt1 $ns rtmodel-at 7 up $lrmon3 $lmcrt1

    Packets that had been on the link are lost and should breathe retransmitted. After failure, celebrate the spoil in packet site visitors within the bandwidth graphs. TCP packets are now taking a different route from web cache to internet customer. Yet the connection is not misplaced on account of the failure, considering that they are able to discern that packets are noiseless being exchanged between client and cache. If the pomp of nodes isn't to your liking, which you could trade it the exercise of the Re-design role button within the simulator window. whereas taking Part in the simulation, you can trade the step the usage of the slider bar. This may breathe in particular valuable during the link failure between three and 7 seconds to discern dropped packets.

    an additional Interesting point of this status of affairs is the visible server-cache and customer-cache interaction. which you can discern a model of actual-time fair interactions on the cyber web. Of route, stand in wit that this is a generalized simulation.

    NS2 Graphical Editor

    if you determine on a graphical interface to setup network simulations, NAM helps a drag-and-drop person interface. you could set network nodes, hyperlink them together and outline person agents and their linked utility or site visitors generator. SCTP isn't included during this interface because the patch was particular to NS2 supply code, now not NAM. NAM is useful for directly constructing a network topology. besides the fact that children, they skilled distinct segmentation faults complete the artery through enhancing (lower back up your data frequently).

    the following instance explains a artery to exercise primary NAM facets. step one is to genesis an illustration of NAM by using executing ./nam. settling on New in the file menu, you're going to discern the editor window seem. For this example, they are attempting to build the topology considered in figure 6.

    On the toolbar, click on on the Add node button and location three nodes in editor window by artery of perquisite clicking on the rectify positions. To link nodes, click on Add hyperlink. select one node and drag-click on to the subsequent node to create link. next, opt for which brokers you need to exercise on community in agent drop-down menu. to add an agent, click on on the applicable node. lastly, you opt for what applications you need to simulate: both FTP or CBR source. to add an software, click on the chosen agent. At this element, that you may arrogate click on on different features for your topology and edit their properties corresponding to colour or delivery and conclusion time for functions. in case you regain a dialog adage that you just ought to connect your agents, exercise Add hyperlink and fasten distinctive brokers to simulate your scenario. In case of a blunder, there's a delete button on the toolbar. celebrate that editor and simulation home windows are each a Part of NAM, however simulation need to first breathe interpreted via NS2 in order that NAM can replay the log of simulation.


    We decided to perceive at various NS2 as a result of its aid of SCTP (which is a requirement for us), graphical representations, distinct protocols and a lot of different motives. youngsters, you deserve to patch the supply code in case the protocol you need to simulate isn't supported and live with low-great photos device.

    NS2 is a device that helps you better sustain in wit distinct mechanisms in protocol definitions, reminiscent of congestion manage, that are complicated to discern in live testing. It gives decent documentation and aid for different add-ons. They recommend NS2 as a appliance to aid stand in wit how protocols travail and gain interaction with distinctive network topologies.

    we would relish to implement the want for such tools to breathe open supply and targeted towards supporting Linux. With the emergence of recent protocols, reminiscent of IPv6 and SCTP, NS2 can likewise breathe very helpful for the Open supply community.


    The Open systems Lab at Ericsson analysis for assisting their travail with Linux and open-supply application.

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