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Cisco Services & Technologies
Cisco, as most IT engineers know, covers a wide range of products and services. These range from routers to switches, firewalls, intrusion prevention systems (ips), intrusion detection systems (ids)…
Windows Servers
IT professionals frequently need connectivity and management tools. The Telnet Client is one of the most basic tools for such activities. Using this tool, you can connect to a remote Telnet server an…
Network Cabling
The 10Base-T UTP Ethernet and 10Base-2 Coax Ethernet were very popular in the early to mid 1990's when 100 Mbps network cards and hubs/switches were very expensive. Today's prices have dropped so muc…
TCP - UDP Protocol Analysis
As we have seen in the previous pages, some TCP segments carry data while others are simple acknowledgements for previously received data. The popular 3-way handshake utilises the SYNs and ACKs avail…
Network Protocol Analyzers
When working with medium to large scale networks, IT departments are often faced dealing with network loops and broadcast storms that are caused by user error, faulty network devices or incorrect con…
Windows Servers
Simple Network Management Protocol (SNMP) is a UDP protocol that uses port 161 to monitor and collect detailed information on any network device supporting the SNMP protocol. All Windows servers supp…
Ethernet Protocol, CSMA/CD, Collisions
The following is a description of the Ethernet Frame Format described in the IEEE 802.3 Specification. The 802.3 Specification defines a 14 byte Data Link Header followed by a Logical Link Control He…
OpManager - Network Monitoring & Management
In the rapidly evolving landscape of cyber threats, network security has never been more crucial. With the frequency and sophistication of cyberattacks escalating, organizations are under constant pr…
Network Fundamentals
Network data transmission refers to the process of sending and receiving information between two or more devices connected to a network. It is a critical aspect of modern-day networking, and it enabl…
TCP - UDP Protocol Analysis
The third field under close examination is the TCP Header length. There really isn't that much to say about the Header length other than to explain what it represents and how to interpret its values…
VLAN Networks
VLANs are usually created by the network administrator, assigning each port of every switch to a VLAN. Depending on the network infrastructure and security policies, the assignment of VLANs can be im…
Cisco Routers
If you’re tired of setting up SPAN sessions to capture network traffic transiting your network and Cisco router, it’s time to start using Cisco’s Embedded Packet Capture (EPC), available from IOS 12…

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