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920-468 exam Dumps Source : Nortel VPN Router Rls.7.0 Advanced Configuration & Management
Test Code : 920-468
Test designation : Nortel VPN Router Rls.7.0 Advanced Configuration & Management
Vendor designation : Nortel
: 56 existent Questions
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Nortel VPN Router Rls.7.0 Advanced Configuration
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Assuming you already occupy a functional network, there are many reasons why you may want to regard purchasing a novel router. Obviously, scalability is one reason. You may occupy Run out of Ethernet ports on your router. Your router may live near its shelf life (perhaps it has been serviced too frequently and is off of warranty and/or support), and you know it is time for a newer model. You may occupy a novel requirement to support a different protocol than you occupy been using -- such as RIP2, BGP, IGMP, HSRP, IGRP or OSPF -- and perhaps your existing router does not support this protocol. You might want to implement VLANs into your network. Perhaps you requisite to toil with spanning tree. You may also occupy a novel requirement to provide better failover and redundancy that your existing router just does not provide. Perhaps you want an integrated VPN solution to live portion of your router, without having to depend on a firewall. (There are pros and cons of doing it this way, but clearly if there are budget constraints, an integrated packet filtering router that also provides VPN services for remote client connectivity may really serve you.)
Wireless is another area to consider. Many routers, particularly home-based solutions, tender integrated routers based on wireless solutions, though I would personally recommend a sever access point for your business when doing wireless -- one which is optimized for security. Though it clearly works well for home expend (and I expend one myself at home), I would certainly not purchase a Linksys router/switch/wireless access point for my business.
Support: Some things to considerWhen upgrading to a novel router, you must produce sure that you understand the character of support that you will live getting from your vendor. If you try to proceed with a low-priced router, it may not occupy the technical staff to serve you deal with the problems that will develop. One must also regard the platforms that WAN engineers typically use, as it will live easier to support your environment with industry-standard products that are fully utilized by the majority of companies, little and large.
For both the enterprise and SMB, it is primary to elect a manufacturer that cares enough about their products to educate engineers who are amenable for deploying their solutions (and not just box pushers). For example, Cisco network engineers typically will try to win a CCNA or (if they are really amazing) CCIE certification from Cisco, which showcases their skill sets to employers. Nortel offers an NCA at their highest level, which represents a highly advanced smooth of technical design and analytical expertise for tangled Nortel Networks solutions, also widely acknowledged throughout the industry and regarded a emblem of excellence. Nortel has the greatest telephony experience, having grown up in that world, so I would seriously regard using their infrastructure if you are looking for stalwart VOIP integration. 3Com also offers certification in their technologies. Their router cert is the 3Com Certified WAN Specialist, which demonstrates skills in designing and implementing 3Com WAN solutions, working with 3Com routers and protocols including OSPF and BGP4.
Product lines: What to expectLet's ogle at what a few of the major router vendors tender from their product lines.
For SMBs, Cisco has the 1800 Series, which provides WLAN capabilities along with advanced with advanced security services and management features such as hardware encryption acceleration, IPSec VPN (AES, 3DES, DES), firewall protection, inline intrusion prevention, Network Admission Control, and URL filtering support to allow their smaller customers to implement resilient, scaleable solutions. Cisco helps its clients to optimize networks via a range of products and services, which they tender through their dealer channel. Through their Cisco Registered confederate program, they ensure that their partners are certified annually and occupy the learning and information at their disposal to fully support their customers. 3Com and Nortel also tender similar services. In addition to their SMB routers, Cisco also offers enterprise-wide models, including the 7600 series, their high-end model which offers integrated, high-density Ethernet switching, carrier-class IP/MPLS routing, and 10-Gbps interfaces.
3Com also has a stalwart product line, and I am particularly impressed with their 6000 series model, as it has every feature you can possibly assume of, including frailty tolerance and advanced traffic management and control features. I occupy deployed 3Com-only switch and routing infrastructures with worthy success in the past.
On the Nortel front, they occupy teamed with Microsoft to support Microsoft's Network Access Protection (NAP), an extensible standards-based technology that allows users to more securely access their corporate networks and reduce the complexity of network access for IT administrators. They are also working together with other industry-leading security companies to develop industry standards, network designs and products intended to secure faultfinding information by protecting the communications infrastructure as well as user computing devices dote desktop and laptop computers. This partnership is important, because despite the fact that many WAN folks detest Microsoft, those people will quiet requisite to deal with Microsoft on the PC client side.
Regarding Nortel's product line, I'm impressed with the Nortel Multiprotocol Router 5430, which is being marketed to remote offices that occupy outgrown smaller offshoot office routers. It can support concurrent, compute-intensive applications such as IP property of Service, IP multicast, compression and VPNs. It also has support for multiple WAN technologies -- including ATM T1/E1 and T3/E3, frame relay, PPP and ISDN.
Cisco has its own propriety product called the Cisco Systems' Network Admission Control (NAC), which will also carefully resolve any PC that wants to attach to your network, to check for the presence and status of antivirus and personal firewall software and report on the configuration of the machine. I feel Nortel has the handicap here, because most desktop clients are Microsoft, and it is to their handicap that unlike Cisco, they occupy chosen to confederate with them, and not develop their own proprietary standards.
In conclusion, I will reiterate that when looking to purchase novel routers for the enterprise, one must ogle for VPN capability, mulit-protocal support, integration with other networks, security enhancements (I.E (3-DES encryption) and direct vendor support. Though I would not vacillate to cost out alternate solutions, I prefer industry-standard products for the enterprise.
Kenneth Milberg is systems consultant with his own independent consulting firm, Unix-Linux Solutions. He has fifteen years of experience with Unix and Linux systems, as well as broad technical and functional experience with AIX, HP, SCO, Linux and Solaris. Milberg holds certifications with IBM (IBM Certified Systems Expert -- eServer p5 and pSeries Enterprise Technical support AIX 5L V5.3 & IBM Certified Specialist –HACMP), SUN (SCNA,SCSA), HP (HP Certified –HP-UX administration) Cisco (CCNA) and Oracle (OCP-DBO).
The worthy VPN debate
Consider the strengths and weaknesses of IPSec and SSL before picking the technology that's privilege for your virtual private network
By David Essex
Apr 28, 2006
The saga of the Labor Department's attempt to outfit Mine Safety and Health Administration employees with remote access through virtual private networks serves as a minihistory of the technology. In 2003, the agency tried VPNs based on the most well-liked technology of the time: Internet Protocol Security, which essentially provides a direct pipe to the agency network. But administrators got bogged down in tech support. IPSec requires installing a tricky-to-configure program on every remote machine. Plus, firewall and other network conflicts can value serve desk nightmares.
The following year, the agency moved to Secure Sockets Layer VPNs. Touted as IPSec's heir apparent, SSL VPNs employ Web browser technology that requires diminutive or no client software. The agency installed SSL VPN appliances from Juniper Networks and by spring 2005 had 2,200 employees using remote access'and a huge drop in service calls.
Many agencies, if they occupy not already done so, will soon countenance the issue of what technology they should expend to connect remote workers. While the propel for more telecommuting by federal employees is a major driver of VPN demand, experts also cite stalwart interest from agencies implementing catastrophe recovery plans.
'A lot of governments feel they requisite to occupy fail-safes in status so that if up to 75 percent of the employees occupy to toil at home, they will live able to exploit that spike,' said Robert Whiteley, senior analyst at Forrester Research.
In fact, VPN sales are skyrocketing across complete industries. According to International Data Corp., a market research firm, worldwide sales of just $75 million in 2003 nearly tripled to $200 million the following year and were estimated to close out 2005 at $325 million.
Pros and cons
In a nutshell, a VPN is a route to link network nodes over the public Internet while keeping the connection private, using encryption and other security techniques.
Here's the faultfinding contrast between the two main technologies: IPSec essentially opens a fully functioning pipeline directly to the internal LAN, while SSL provides access to a select group of applications.
'IPSec is dote an extension of your LAN,' Whiteley said. 'It's a Layer 3 pipe, and pretty much every application will Run over it. SSL sits above that, in Layer 4 or 5, so it doesn't necessarily toil with complete applications.' Still, SSL vendors occupy found ways around these limitations, Whiteley said.
In practice, the contrast in client-side software means IPSec may live preferable for securely linking two computers in different locations, called a site-to-site VPN. IPSec proponents also jabber it is superior for transferring great files.
With its simple setup, SSL is generally better for quickly activating great numbers of remote users, even on an ad hoc basis.
'IPSec VPNs are the pellucid altenative when you occupy two dedicated endpoints,' said Tim Simmons, product marketing manager at Citrix Systems, a maker of SSL VPN appliances and remote-access servers for the Defense Department and other great agencies. 'SSL VPNs really outstrip at the connections to multiple unknown clients.' Several SSL-oriented vendors jabber they invested in the technology precisely to serve organizations avoid problems they had getting IPSec to traverse network address translation and firewalls.
Using Firewalls To forestall Unauthorized Access
The method, by which you can physically secure the network, is through the usage of firewalls. While firewalls provide some smooth of physical security, you should suffer in intellect that firewalls are just barriers which produce it difficult for intruders to assault the network.
Firewalls are categorized as follows:
Firewalls toil by checking packets to determine whether packets should live permitted to live forwarded, or whether packets should live dropped. The main role of the firewall is to filter traffic. TCP/IP packets occupy an IP packet header, followed by the actual content of the packet. The IP packet header is either a TCP header or a UDP header. The TCP header or UDP header contains the IP addresses and port number of the sender (source), and the IP addresses and port numbers of the receiver (destination). A TCP header contains the following additional information as well: Sequence numbers and acknowledgment numbers, and conversation state.
As packets pass over the firewall, packets are examined according to the filtering parameters configured for the firewall to filter traffic on. The filtering parameters define which packets should live allowed to pass over the firewall. The default configuration is that firewalls typically disaffirm complete packets other than those which it has been explicitly set up to allow. In networking environments, firewalls are usually configured to obstruct complete incoming traffic, and to allow outbound traffic from the private internal network.
Packet filters are used to define the traffic types that should live denied by a firewall. You requisite to implement firewalls and router packet filters to secure the resources within your private network from Internet users.
When you configure IP packet filters, you can specify what traffic is allowed or denied, based on the following:
Source and destination TCP port number
Source and destination UDP port number
The interface that the packet arrives on.
The interface that the packet should live forwarded to
IP protocol numbers
ICMP types and codes
IP packet filters should live used for the purposes:
To restrict traffic being sent to, or from a specific computer, you can filter on source/destination IP address range.
To restrict traffic coming from, or being sent to a specific IP address range of a network segment, you can filter on source/destination IP address range.
To restrict traffic being transmitted to/from a particular application, you can filter on protocol number.
Advanced firewalls include a number of additional security features, including:
Stateful inspection: Here, packets are examined when they attain the firewall. However, packets are allowed to access internal network resources as determined by the configured access policy. Stateful inspection capabilities are provided by proxy servers and firewall solutions that support Network Address Translation (NAT).
Intrusion detection features: Firewalls that include intrusion detection features are able to detect possible network assault attributes as they inspect packets. These firewalls can fulfill a number of activities when they detect a network attack:
Start a counter attack.
Block access from the network of the intruder.
Notify an administrator of the network attack.
Application layer intelligence capabilities: These firewalls allow or drop packets based on the content of the packet. The firewalls are capable of inspecting and analyzing data within the traffic flows.
Virtual Private Network (VPN) capabilities: These types of firewalls enable remote networks to connect with other remote networks over the Internet. If you expend both a VPN and a firewall solution, the firewall is able to filter traffic within the VPN tunnel.
If the Exchange organization accesses external networks, you should expend a firewall to protect the Exchange organization. A stalwart firewall solution should live used to protect back-end Exchange servers. Front-end servers usually exist in the demilitarized zone (DMZ) or perimeter network.
A perimeter network usually consists of the following elements:
A firewall for protecting the front-end servers from the Internet traffic.
A firewall between the back-end servers and private network. This firewall should allow communication between back-end servers and specific servers located on the private network.
Hardened servers for supporting the services provided by the applications. Hardened servers can live configured to disable unsafe Internet services.
A perimeter network is either a sole firewall configuration, or back to back firewall configuration:
Single firewall configuration: Here a sole firewall is used with a network interface card (NIC) connected to the perimeter network, a NIC connected to the Internet, and another NIC connected to the private network. The private network comprises of the organization’s network, computers and servers that are not extended to the public network. This is the simplest firewall configuration strategy. Because this configuration consists of only one firewall, the private network is vulnerable when an attacker is able to bypasses the firewall.
Back to back firewalls configuration: Here, one firewall is utilized to connect the front tarry of the perimeter network to the Internet, and another firewall is utilized to connect the back tarry of the perimeter network to the private network. This fashion provides more protection to the private network. Additional firewalls can live implemented between the Web tiers in the perimeter network to further enhance security for the private network.
You can expend TCP port filtering to secure network applications and services. TCP port filtering allows you to control the character of network traffic that reaches your Exchange servers through the restriction of connections to specific TCP ports.
A few common TCP ports are listed here:
Port 25; Simple Mail Transfer Protocol (SMTP)
Port 80; Hypertext Transfer Protocol (HTTP)
Port 88; Kerberos
Port 102; Message Transfer Agent (MTA)
Port 110; Post Office Protocol v3 (POP3)
Port 119; Network word Transfer Protocol (NNTP)
Port 135; Exchange administration, RPC, client server communication
Port 143, Internet Message Access Protocol version 4 (IMAP4)
Port 389, Lightweight Directory Application Protocol (LDAP)
Port 443, HTTP using Secure Sockets Layer (SSL)
Port 563, NNTP using Secure Sockets Layer (SSL)
Port 636, LDAP using Secure Sockets Layer (SSL)
Port 993, IMAP4 using Secure Sockets Layer (SSL)
Port 995, POP3 using Secure Sockets Layer (SSL)
Port 3268 – Port 3269; Global catalog lookups
MAPI Client Connection Across a Firewall
Messaging Application Programming Interface (MAPI) is a specification that provides a common fashion to access messaging backbones. A Messaging Application Programming Interface (MAPI) based Exchange client is a messaging application which communicates with an Exchange Server using MAPI and Exchange transport. A MAPI information service should live available for the messaging backbone prior to using a MAPI based client. Because MAPI defines standardized interfaces at two layers, a client interface and service provider interface; client applications and information services can live created. MAPI remains consistent regardless of the backbone and information services used.
RPC over HTTP makes it possible for remote users to access Exchange Server 2003 through Outlook 2003 MAPI client over the Internet.
To enable RPC over HTTP, the following configuration has to live performed on the front-end server for the remote connection:
RPC over HTTP Proxy Windows component has to installed.
IIS has to live configured to support RPC over HTTP communication.
Through RPC over HTTP, messages sent by a MAPI client are able to access the Exchange Server 2003 server through a firewall. When using RPC over HTTP, Outlook users can connect directly to an Exchange server over the Internet through HTTP. Whether the Exchange server and Outlook reside on different networks, and is behind firewalls is irrelevant. RPC over HTTP provides remote users with secure communication access to the Outlook features of the MAPI client.
When you install and configure RPC over HTTP, the Exchange front-end server becomes a RPC proxy server that defines the ports that the RPC client uses to connect to the Exchange servers, global catalog servers and domain controllers.
The RPC proxy server can live deployed or located as follows:
Inside the firewall: If you achieve not want to open the ports for the RPC proxy server to connect to other computers, then you can configure the RPC proxy server on an Exchange Server 2003 front-end server in the firewall and install a ISA server in the demilitarized zone (DMZ). The ISA server will then forward RPC over HTTP requests to the Exchange front-end server.
On the demilitarized zone (DMZ): To reduce the number of ports used by the RPC proxy server, you can configure the RPC proxy server on an Exchange Server 2003 front-end server in the demilitarized zone (DMZ).
Configuring Exchange Server 2003 to expend RPC Over HTTP
The following steps occupy to live performed to configure Exchange Server 2003 to expend RPC over HTTP:
Configure the front-end Exchange server as the RPC proxy server.
Configure the RPC virtual directory in Internet Information Services (IIS) for basic authentication.
Configure the registry on the back-end Exchange server to expend the specific number of ports. This should live the back-end Exchange server which communicates with the RPC proxy server.
Configure the ports as being open on the internal firewall on the Exchange back-end server.
Configure the Outlook profile for users to utilize RPC over HTTP.
How to install the RPC over HTTP Proxy Windows component
Log on to the front-end Exchange server.
Open Control Panel.
Click Add or Remove Programs.
Select Add/Remove Windows Components.
The Windows Components dialog box opens.
Select Network Services and click the Details button.
The Networking Services Component dialog box opens.
Select the RPC over HTTP Proxy.
Click Next to install the RPC over HTTP Proxy Windows component
How to configure the RPC virtual directory in Internet Information Services (IIS) for basic authentication
Click Start, Administrative Tools, and then click Internet Information Services (IIS) Manager on the Exchange front-end server.
The IIS Manager console opens.
In the left pane, expand the server node, Web sites, and then Default Web Site.
Right-click Rpc and select Properties from the shortcut menu.
The Rpc Properties dialog box opens.
Click the Directory Services tab.
Uncheck Enable Anonymous Access.
Select Basic Authentication. Integrated Windows Authentication is by default selected.
How to configure the registry on the back-end Exchange server to expend the specific number of ports
Open the Registry Editor on the Exchange front-end server.
Navigate to the HKEY_LOCAL_MACHINESoftwareMicrosoftRpcRpcProxy registry key.
Right-click sound Ports and then select Modify on the shortcut menu.
In the Edit String window provide the confiscate Exchange front-end server information.
Close the Registry Editor on the Exchange front-end server.
Open the Registry Editor on the Exchange back-end server.
Navigate to the HKEY_LOCAL_MACHINESYSTEM CurrentControlSetServicesMSExchangeSAParameters registry key.
Right-click Rpc/HTTP NSPI Port and then select Modify on the shortcut menu.
Select Decimal in the foundation window.
In the Value Data field, provide the confiscate information.
Right-click HTTP Port and select Modify from the shortcut menu.
Select Decimal in the foundation window.
In the Value Data field, provide the confiscate information.
Navigate to the HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesMSExchangeISParametersSystem registry key.
Right-click RPC/HTTP Port and select Modify from the shortcut menu.
Select Decimal in the foundation window.
In the Value Data field, provide the confiscate information.
Close the Registry Editor on the Exchange back-end server.
How to configure the Outlook profile for users to utilize RPC over HTTP
The following default settings provide the most secure fashion of user connection:
Connect with SSL Only
Mutually Authenticate the Session When Connecting with SSL
Password Authentication is NTLM
To configure the Outlook profile for users to utilize RPC over HTTP,
On the back-end Exchange server, open Control Panel.
In the survey also pane, select Control Panel Options and then Mail.
Click argue Profiles.
When the Mail dialog box opens, click Add.
In the novel Profile dialog box, in the Profile designation box, enter a designation for the profile that you are creating.
Select the Add A novel E-Mail Account option and click Next.
The Exchange Server Settings dialog box opens.
Enter the Exchange server designation and the account user name.
Click Check Names and the click OK.
Click More Settings.
Click the Connection tab.
In the Connection area of the tab, select the Connect Using Internet Explorer’s Or A 3rd Party Dialer option.
In the Modem area of the Connection tab, select the Connect To My Exchange Mailbox Using HTTP option.
Click Exchange Proxy Settings.
In the expend This URL To Connect To My Proxy Server For Exchange box, provide the confiscate URL information.
Select the Connect Using SSL Only option.
Select the Mutually Authenticate The Session When Connecting With SSL option.
In the Principal designation For Proxy Server box, provide the principal designation information.
For a user that resides on a mercurial network, the default connection order can live left unchanged. This is to connect through TCP/IP first and then HTTP.
Fora user that resides on a leisurely network, change the default connection order to connect through HTTP first and then TCP/IP.
In the Proxy Authentication Settings area of the Exchange Proxy Settings page, select the Basic Authentication option from the expend This Authentication When Connecting To My Proxy Server For Exchange drop-down list.