The Network DNA
JUNE 4, 2024
CCNA: TCP/IP Stack TCP/IP Stack is the most widely used protocol stack. TCP/IP stack is a conceptual model consisting of network communication protocols. TCP/IP stack has four layers Application, Transport, Internet, and Network Interface. TCP/IP networks use TCP or UDP protocol at this layer.
The Network DNA
JUNE 17, 2024
CCNA: TCP 3-Way Handshake In this article, lets take a look at TCP three-way handshake and other useful information that makes TCP a reliable communication protocol. Before TCP can send any traffic, it first contacts the other device and establish a reliable and controlled connection.
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The Network DNA
JUNE 19, 2024
CCNA: TCP Sequence & Port Number This article can be read as the second part of the previous article CCNA: 3-Way Handshake where we discussed what makes TCP a reliable protocol for transmitting information. Lets discuss the TCP SEQ and Port numbers in this article. TCP breaks this information into two pieces CC and NA.
Network Engineering
JANUARY 15, 2025
I have a TCP server running on my Ubuntu gateway computer at 10.0.0.1:8080. My Wi-Fi is connected to the gateway's LAN (enp4s0) port, and my modem is in bridge mode and plugged into enp3s0. I can tell the service is working correctly because when I use curl -x 10.0.0.1:8080
The Network DNA
JULY 31, 2024
An administrator configures default gateway configuration manually while configuring the system on the LAN or it can be configured automatically using the DHCP protocol. Any host that is not part of the source device network can be reached through the default router or gateway.
The Network DNA
JULY 16, 2024
CCNA RnS Article #27: VLAN Trunking Configuration CCNA RnS Article #26: Configuring VLANs CCNA RnS Article #25: Inter-VLAN Routing CCNA RnS Article #24: VLAN Tagging CCNA RnS Article #23: Virtual LAN (VLAN) Concept CCNA RnS Article #22: Interface Auto-negotiation in Action!
Network Engineering
JANUARY 17, 2025
Starting from this MTU, I should be able to calculate the optimal MSS value to be set for my LAN interfaces, right? There are many values and recommendations, but as far as I understand the real question is what is the actual MTU of the WAN link which depends on the type of connection (cable, PPPoE, etc.). With 1473 I get fragmentation.
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