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Test Code : 922-090
Test designation : Communication Server 1000 Rls.5.0 and IP Networking Design
Vendor designation : Nortel
real questions : 30 actual Questions

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Communication Server 1000 Rls.5.0 and IP Networking Design exam

community Design points and add-ons | 922-090 actual Questions and VCE rehearse Test

This chapter is from the booklet 

As you create a network protection coverage, you ought to define techniques to guard your community and users towards harm and loss. With this direct in intellect, a network design and the protected components play a vital position in enforcing the ordinary protection of the company.

An typical security solution includes design facets and add-ons akin to firewalls, VLANS, and perimeter community boundaries that distinguish between inner most networks, intranets, and the information superhighway. This region discusses these elements and should succor you inform them aside and reckon their feature in the safety of the community.

Demilitarized Zone

A demilitarized zone (DMZ) is a tiny community between the inside network and the web that provides a layer of safety and privacy. both interior and external users may additionally beget restrained access to the servers within the DMZ. determine three.three depicts a DMZ.

commonly, net and mail servers are positioned in the DMZ. because these gadgets are uncovered to the information superhighway, it's captious that they are hardened and patches are saved latest. desk 3.2 lists the most ordinary functions and ports which are race on servers interior the DMZ.

desk three.2. regularly occurring Ports on Servers within the DMZ









fifty three




one hundred ten




The DMZ is a neighborhood that enables exterior users to entry information that the organization deems integral however will now not compromise any inside organizational counsel. This configuration makes it possible for outside access, yet prevents external clients from without deliberate having access to a server that holds internal organizational data.


An intranet is a component of the interior community that uses web-based applied sciences. The suggestions is saved on web servers and accessed the usage of browsers. however web servers are used, they don’t always beget to breathe purchasable to the outdoor world. here is possible since the IP addresses of the servers are reserved for private, interior use. You study more about private IP addresses within the “NAT” section, later during this chapter. If the intranet can moreover breathe accessed from public networks, it would breathe via a digital private network (VPN) for safety causes. VPNs are described in more desirable detail in Chapter 6, “Securing Communications.”


An extranet is the common public constituent of the enterprise’s IT infrastructure that enables materials to breathe used by passage of licensed companions and resellers which beget material authorization and authentication. This type of association is ordinary for enterprise-to-business relationships. because an extranet can provide legal responsibility for an organization, supervision must breathe taken to ensure that VPNs and firewalls are configured adequately and that security policies are strictly enforced.

virtual endemic enviornment network

The intent of a digital local region community (VLAN) is to unite network nodes logically into the very broadcast domain inspite of their actual attachment to the community. VLANs deliver a means to restrict broadcast traffic in a switched community. This creates a limit and, in essence, creates assorted, isolated LANs on one switch. because switches operate on Layer 2 (information link layer) of the OSI mannequin, a router is required if information is to breathe passed from one VLAN to an extra.

body tagging is the know-how used for VLANs. The 802.1Q common defines a mechanism that encapsulates the frames with headers, which then tags them with a VLAN id. VLAN-mindful community devices search for these tags in frames and acquire acceptable forwarding selections. A VLAN is definitely a utility solution that permits developing entertaining tag identifiers to breathe assigned to distinctive ports on the switch.

the most extraordinary capitalize of using a VLAN is that it will probably span distinctive switches. because users on the equal VLAN don’t should breathe linked by means of physical vicinity, they can moreover breathe grouped by passage of fork or function. here are the advantages that VLANs give:

  • users will moreover breathe grouped by using department in preference to actual vicinity.
  • relocating and including clients is simplified. No recollect the space a user physically moves, adjustments are made to the application configuration within the switch.
  • as a result of VLANs permit users to breathe grouped, making exercise of safety policies turns into more convenient.
  • take into account that exercise of a VLAN isn't an absolute protect towards security infringements. It does not give the very stage of security as a router. A VLAN is a software retort and cannot engage the space of a well subnetted or routed community. it is viable to acquire frames hop from one VLAN to another. This takes talent and skills on the a allotment of an attacker, however it is viable. For more information about frame tagging and VLANs, note the “counseled analyzing and substances” section at the conclusion of the chapter.

    network maneuver Translation

    community maneuver Translation (NAT) acts as a liaison between an internal network and the internet. It allows for distinctive computers to connect to the information superhighway the usage of one IP tackle. a vital safety constituent of NAT is that it hides the inner network from the outdoor world. in this circumstance, the inside community makes exercise of a personal IP handle. special stages in each IP tackle class are used particularly for private addressing. These addresses are regarded nonroutable on the cyber web.

    listed here are the private address stages:

  • class A— network. legitimate host IDs are from to
  • classification B—172.sixteen.0.0 via networks. convincing host IDs are from through
  • category C— network. convincing host IDs are from to
  • For smaller companies, NAT can moreover breathe used in the configuration of windows information superhighway Connection Sharing (ICS), where everything machines partake one information superhighway connection, akin to a dial-up modem. NAT can moreover breathe used for maneuver translation between varied protocols, which improves safety and gives for greater interoperability in heterogeneous networks.


    Subnetting may moreover breathe done for a few motives. if you beget a class C tackle and 1,000 valued clientele. you'll must subnet the community or exercise a custom subnet masks to accommodate the entire hosts. essentially the most ordinary reason networks are subnetted is to maneuver community site visitors. Splitting one community into two or more and the exercise of routers to connect each subnet collectively means that proclaims can breathe restrained to each subnet. youngsters, regularly networks are subnetted to ameliorate network protection, not simply efficiency. Subnetting lets you arrange hosts into the diverse analytic companies that isolate each subnet into its own mini network. Subnet divisions will moreover breathe in line with enterprise desires and protection policy goals. as an example, most likely you utilize shrink people and exigency to retain them separated from the organizational personnel. frequently, organizations with branches exercise subnets to maintain every department separate. When your computers are on divorce physical networks, you can divide your network into subnets that permit you to acquire exercise of one secrete of addresses on several actual networks. If an incident happens and moreover you notice it perquisite now, you can always comprehend the problem to that particular subnet.

    word that the 127 community address is missing. despite the fact the network is in technically in the classification A enviornment, the exercise of addresses during this ambit reasons the protocol software to recrudesce records devoid of sending site visitors throughout a network. for instance, the tackle is used for TCP/IP loopback testing, and the maneuver is used with the aid of most DNS black lists for checking out applications. should you want extra review on IP addressing and subnetting, a wide variety of guidance is purchasable. One such site is determine three.4 indicates an inside community with two several subnets. notice the IP addresses, subnet masks, and default gateway.

    Figure 3.4

    determine 3.4 A segmented community. notice the subnets and recognized subsequent to the router. These don't look to breathe legitimate IP addresses for a community router and are used to establish the 192.168.1.x and 192.168.2.x networks in routing tables.

    IPv6 is designed to substitute IPv4. Addresses are 128 bits in preference to the 32 bits utilized in IPv4. just as in IPv4, blocks of addresses are set aside in IPv6 for personal addresses. In IPv6, internal addresses are called pleasing endemic addresses (ULA). Addresses rise with fe80: are referred to as link-native addresses and are routable only in the local link area. IPv6 addresses are represented in hexadecimal. For more suggestions about IPv6, hunt counsel from

    community Interconnections

    besides securing ports and protocols from outdoor attacks, connections between interconnecting networks should breathe secured. This circumstance may moreover approach into play when a firm establishes community interconnections with partners. This may breathe within the benign of an extranet or specific connection between the worried agencies as in a merger, acquisition, or joint task. company companions can encompass government groups and industrial organizations. however this type of interconnection raises functionality and reduces prices, it may halt up in protection dangers. These dangers consist of compromise of everything related techniques and any network linked to these methods, along with publicity of data the methods handle. With interconnected networks, the edge for damage tremendously raises because one compromised device on one network can with no hardship unfold to other networks.

    Organizational guidelines should require an interconnection settlement for any device or community that shares counsel with one other exterior system or network. groups should cautiously reckon risk-management methods and confirm that the interconnection is correctly designed. The partnering organizations beget diminutive to no manage over the management of the different celebration’s gadget, so devoid of cautious planning and assessment, each parties can breathe harmed. country wide Institute of standards and expertise (NIST) particular engage (SP) 800-47, security e engage for Interconnecting guidance know-how programs, offers tips for any organization that is seeing that interconnecting with a government agency or other company.

    network access manage

    One the most profitable the perquisite passage to offer protection to the community from malicious hosts is to exercise community access maneuver (NAC). NAC offers a method of enforcement that helps acquire positive computer systems are effectively configured. The premise at the back of NAC is to comfy the ambiance by inspecting the user’s computer and in keeping with the consequences supply (or now not provide) entry for that reason. it is in response to assessment and enforcement. as an instance, if the user’s desktop patches aren't updated, and no desktop firewall application is installed, which you could acquire a decision even if to restrict entry to network supplies. Any host computing device that doesn’t harmonize to your described coverage can breathe relegated to remediation server, or placed on a visitor VLAN. The primary add-ons of NAC products are

  • entry requestor (AR)—here is the gadget that requests entry. The evaluation of the machine may moreover breathe self-performed or delegated to a different equipment.
  • coverage determination constituent (PDP)—here's the device that assigns a coverage in keeping with the assessment. The PDP determines what access should noiseless breathe granted and might breathe the NAC’s product-management equipment.
  • coverage enforcement constituent (PEP)—this is the device that enforces the policy. This gadget may well breathe a swap, firewall, or router.
  • The 4 approaches NAC techniques can moreover breathe integrated into the network are

  • Inline—An appliance within the line, constantly between the access and the distribution switches
  • Out-of-band—Intervenes and performs an assessment as hosts approach online and then supplies commandeer entry
  • change primarily based—corresponding to inline NAC apart from enforcement happens on the swap itself
  • Host primarily based—depends on an installed host agent to examine and enforce entry coverage
  • moreover presenting the skill to implement security policy, comprehend noncompliant users, and mitigate threats, NAC presents a pair of enterprise advantages. The company benefits consist of compliance, a stronger security posture, and operational cost management.


    The transmission of information via machine in a telecommunications environment is known as telephony. Telephony comprises transmission of voice, fax, or other statistics. This region describes the components that should breathe regarded when securing the ambiance. often, these add-ons are omitted because they don't look to breathe in fact network components. although, they exercise communications device it is liable to assault and for this reason beget to breathe secured.


    The telecommunications (telecom) gear and private department trade (PBX) are a essential allotment of a company’s infrastructure. anyway the typical block, there are additionally PBX servers, the space the PBX board plugs into the server and is configured via application on the desktop. Many businesses beget moved to Voice over IP (VoIP) to integrate computer telephony, videoconferencing, and document sharing.

    For years PBX-type programs had been centered by hackers, in particular to accept free long-distance carrier. The vulnerabilities that cell networks are region to consist of convivial engineering, lengthy-distance toll fraud, and infraction of statistics privateness.

    To protect your network, breathe positive the PBX is in a comfy enviornment, any default passwords were modified, and simplest approved protection is carried out. many times, hackers can gain access to the mobile gear by the exercise of convivial engineering because this device is continually serviced through a remote maintenance port.

    Voice over web Protocol

    VoIP uses the cyber web to transmit voice information. A VoIP device may breathe composed of numerous accessories, together with VoIP phones, computer techniques, PBX servers, and gateways. VoIP PBX servers are vulnerable to the very category of exploits as other network servers. These attacks consist of DoS and buffer overflows, with DoS being the most universal. additionally, there are voice-particular attacks and threats. H.323 and Inter Asterisk exchange (IAX) are specifications and protcols for audio/video. They allow VoIP connections between servers and enable client/server communication. H.323 and IAX protocols may moreover breathe prostrate to sniffing everything through authentication. This allows for an attacker to attain passwords that may breathe used to compromise the voice community. Session Initiation Protocol (SIP) is widely used in immediate messaging, nevertheless it can moreover breathe used as an preference for VoIP. using SIP can depart VoIP networks open to unauthorized transport of facts. Man-in-the-middle attacks between the SIP cell and SIP proxy enable the audio to breathe manipulated, inflicting dropped, rerouted, or playback calls. Many accessories accommodate a VoIP network, and VoIP protection is built upon many layers of medium records protection. for this reason, access can breathe received in a lot of areas.

    enforcing here options can assist mitigate the hazards and vulnerabilities associated with VoIP:

  • Encryption
  • Authentication
  • information validation
  • Nonrepudiation
  • Modems

    Modems are used via the telephone line to dial in to a server or desktop. they are regularly being replaced through excessive-velocity cable and Digital Subscriber Line (DSL) solutions, which are quicker than dial-up entry. youngsters, some businesses nevertheless exercise modems for employees to dial into the community and toil from home. The modems on network computer systems or servers are usually configured to engage incoming calls. Leaving modems open for incoming calls with diminutive to no authentication for users dialing in will moreover breathe a transparent security vulnerability within the network. for example, warfare-dialing assaults engage competencies of this condition. warfare-dialing is the technique by which an automatic utility application is used to dial numbers in a given ambit to examine whether any of the numbers are serviced with the aid of modems that settle for dial-in requests. This assault may moreover breathe set to goal related modems that are set to obtain calls without any authentication, thus enabling attackers an easy path into the community. you could resolve this issue enviornment in a few techniques:

  • Set the callback points to beget the modem designation the user returned at a preset number.
  • be inevitable authentication is required the usage of mighty passwords.
  • be inevitable employees beget not set up modems at their workstations with far flung-control utility set in.
  • Cable and DSL modems are typical at the present time. They act more relish routers than modems. although these devices aren't liable to struggle-dialing attacks, they accomplish current a inevitable amount of danger by using retaining an at everything times-on connection. if you retract away the connection on the entire time, a hacker has ample time to accept into the computer and the community. the exercise of encryption and firewall solutions will assist maintain the atmosphere secure from assaults.

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