Posts by Jerry Sheehan

IPv6 offers a massive 39-digit address range. This is much bigger than IPv4’s 4.3 billion addresses. It means the internet can grow without running out of addresses. An IP address is like a digital ID for each device. It helps guide data across networks. By planning these addresses, we can keep our online activities safe…

Almost 75% of big networks use trunk ports for VLAN traffic. This shows trunking is key for both large and small networks. Understanding access port vs trunk port is important. Access ports connect one VLAN to devices like computers or printers. Trunk ports, on the other hand, handle many VLAN tags for links between switches…

Cisco switches are key in over 90% of enterprise networks. They keep data moving across important connections. This makes switchport configuration a vital skill for network experts. One switchport command can make a big difference. It can either improve performance or compromise security. So, every setting is critical. This guide will show you how switchport…

The average cost of a malware attack on a company is $2.4 million. This shows how important cybersecurity is for all organizations. They want to make their network security and cyber defense stronger. IDS vs IPS are key to modern protection. A firewall stops unwanted traffic. An intrusion detection system looks for suspicious behavior. An…

Did you know 70% of modern organizations use automated settings for their browsers? This shows how important a pac file is for directing web traffic and improving network speed. A pac file uses a JavaScript function called FindProxyForURL to decide if a request goes through a proxy or directly. As you learn about pac files,…

Did you know a traceroute can go up to 30 hops by default? It checks each hop to find network gaps. But, long traces can cause cisco traceroute problems, making you stop early. Many admins choose to stop traceroute in cisco devices. This saves time when routes seem frozen or not complete. This blog shows…

Did you know the OSPF header is only 24 bytes? This small size lets each ospf packet move quickly through networks. OSPF uses different packets to share route info. For some links, the default hello interval is 10 seconds. This keeps routers in sync and ready for updates. A well-crafted ospf packet carries key info…

Did you know combining multiple network links can boost real-world throughput a lot? This can save businesses a lot of time and money. It’s all about etherchannel vs port channel and how link aggregation is key for data centers. Both terms might seem similar. But what’s the difference between etherchannel and port channel? EtherChannel is…

Did you know the wrong switch can slow down a network and increase costs? Many small businesses find out too late about the layer 2 and layer 3 difference. Layer 2 is simple for small setups, while big companies need layer 2 vs layer 3 routing for growth. Choosing between layer 3 and layer 2…

It’s surprising that a single 4000-byte ICMP datagram can break into pieces. This happens because the maximum size for data in standard Ethernet is just 1500 bytes. This process is called ip fragmentation. It helps bigger data move through routers without getting blocked. This guide explores what ip fragmentation is and why it’s important for…