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.

TCP 52

TCP Ethernet Protocol LAN 52

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.

TCP 52

TCP Ethernet Port LAN 52

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.

Port 52

Port TCP Ethernet LAN 52

The Network DNA

JULY 16, 2024

To do that it builds the Ethernet Frame and puts its MAC address as the Source MAC address (SMAC) and layer 2 broadcast address (ff:ff:ff:ff:ff:ff). PC-2 now creates an Ethernet frame to respond to the ARP. IP address. A switch forwards the broadcast out all the ports in same VLAN (except the port where broadcast was received).

Protocol 98

Protocol Ethernet IP Address LAN 98

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. This packet is encapsulated in Ethernet frame and using the ARP entries on the Host A it forwards the frame to the default gateway on the network.

IP Address 98

IP Address Ethernet Routers Gateway 98

The Network DNA

JUNE 11, 2024

CCNA: Ethernet Frame Today lets talk about the Ethernet Frame and its different fields. Understanding the Ethernet Frame and fields helps to understand the communication between systems and troubleshooting when things are not in place. A typical Ethernet frame looks like the one in Figure 1.

Ethernet 40

Ethernet LAN TCP Protocol 40

The Network DNA

JANUARY 26, 2025

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!

Ethernet 59

Ethernet LAN Protocol TCP 59