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When you dial a number that is a layer 3 network service or phone number routing. The specific language that you are speaking is layer 6 presentation and layer 7 application services.

OSI Layers and Your Business Network

The application interfaces with the OSI model at layer 7, which is the application layer. The network driver software is typically found at layer 1 through layer 4 while application developers will focus on layers 5 – 7 of the OSI model. Some network software such as SNA does not define a network layer 3. An example is integrating an SNA network which doesn’t have a network layer with a Windows network using IP network services.

OSI Network Model

The OSI model consists of 7 layers as shown:

• 7 Application
• 6 Presentation
• 5 Session
• 4 Transport
• 3 Network
• 2 Datalink
• 1 Physical

For this troubleshooting example we will start at the top or Application (layer 7) layer of the OSI model and work our way down to the Physical (layer 1) layer.

The Upper Layers – Layers 7 – 5 (Application, Presentation, Session)

• Can you send / recieve email
• Are your Internet Explorer connection settings correct

The Transport Layer

The Network Layer

Examples of Network Layer troubleshooting are:

• Can you ping your default gateway
• Are you IP settings correct
• Has your network adaptor been assigned an APIPA address
• Are your DNS / DHCP settings correct

The Data Link Layer

Examples of Data Link Layer troubleshooting are

• Is the light lit on your network interface card (NIC)
• Is your NIC inserted / installed correctly
• Are your wireless settings correct

The Physical Layer

Examples of Physical Layer troubleshooting are:

• Is your network cable connected properly and secure
• Are you using the correct cable type

Oh, my firewall has logs?

However, when most business owners are asked about their firewall logs, the typical response is usually something like, “Oh, my firewall has logs?” Yes, all firewalls produce log files.

Most firewalls designed for the small business market lack features that most small businesses would benefit from. Rarely will these small businesses have someone watching the firewall logs on a consistent basis.

An Example Log File

Let’s review some logs.

Date Time Source IP Source Port Destination IP Destination Port

Same port. This one is from Korea but notice it’s scanning port 2967. When hackers find this port they know exactly what exploit to try.

Regular scans of your network show you what the hackers are seeing of your network.

• 7 Application
• 6 Presentation
• 5 Session
• 4 Transport
• 3 Network
• 2 Datalink
• 1 Physical

For this troubleshooting example we will start at the top or Application (layer 7) layer of the OSI model and work our way down to the Physical (layer 1) layer.

Problems related to browsers, ftp programs, email and network / internet programs can start here.

3 Network – Deals with logical address and routing (path determination) which includes IP addressing.

The Upper Layers – Layers 7 – 5 (Application, Presentation, Session)

• Can you send / recieve email
• Are your username and / or password correct
• Are your Internet Explorer connection settings correct

The Transport Layer

• Do you have a firewall configured on your computer
• Is your firewall blocking ports such as port 80, 21, 53 etc
• Does turning you firewall off resolve the problem

The Network Layer

Examples of Network Layer troubleshooting are:

• Can you ping your default gateway
• Are you IP settings correct
• Can you tracert a well know IP/DNS address / URL
• Has your network adaptor been assigned an APIPA address
• Are your DNS / DHCP settings correct

The Data Link Layer

Examples of Data Link Layer troubleshooting are

• Is the light lit on your network interface card (NIC)
• Is your NIC inserted / installed correctly
• Is the NIC disabled in Device Manager
• Are your wireless settings correct

The Physical Layer

Examples of Physical Layer troubleshooting are:

• Is your network cable connected properly and secure
• Are you using the correct cable type

Using the OSI model we can easily identify or troubleshoot problems with our internet / network connection.

Security Policy Document

The security policy document describes various policies for all employees that use the enterprise network. In addition security policies are defined for Internet e-mail and virus detection.

Perimeter Security

It is security for traffic whose source and destination is an external network. Typical perimeter devices are firewalls, external routers, TACACS servers, RADIUS servers, dial servers, VPN concentrators and modems.

Network Security

The network exists to carry traffic between workstations and network applications. Network applications are implemented on a shared server that could be running an operating system such as Windows, Unix or Mainframe MVS.

· Network operating system domain authentication and authorization

Transaction Security

The following describes industry standard transaction security protocols.

Monitoring Security

Monitoring network traffic for security attacks, vulnerabilities and unusual events is essential for any security strategy. Facilities security is typical badge access to equipment and servers that host mission critical data.

Cisco markets intrusion prevention sensors (IPS) to enterprise clients for improving the security posture of the company network. IPS sensors will examine network traffic real time or inline, comparing packets with pre-defined signatures.

IBM Internet Security Scanner (ISS) is a vulnerability assessment scanner focused on enterprise customers for assessing network vulnerabilities from an external and internal perspective. The software runs on agents and scans various network devices and servers for known security holes and potential vulnerabilities. The process is comprised of network discovery, data collection, analysis and reports. Data is collected from routers, switches, servers, firewalls, workstations, operating systems and network services.

Syslog Server Messaging

Network Security Model – Defining an Enterprise Security Strategy

Many people have relatively uncomplicated needs for their home networks. You’re going to need Cat-5 (or Ethernet) cables for a wired network.