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CCNA: TCP SEQ and Port Number

The Network DNA

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. These applications are identified using the port numbers.

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CCNA: Address Resolution Protocol (ARP)

The Network DNA

A switch forwards the broadcast out all the ports in same VLAN (except the port where broadcast was received). CCNA RnS #17: Switching Process CCNA RnS #16: Campus vs Data Center Network CCNA RnS #15: Memory Types - The Network DNA CCNA RnS #14 - CLI Introduction! - CCNA RnS Article #18: Secure Switch Management Plane!

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CCNA: MAC Address Table

The Network DNA

This table is populated automatically when a switch receives a frame on a port. As a frame is received on a port, its source MAC address is noted. The switch receives the frame from PC-1 that contains the MAC address 80::01 on port 1. Port 1 is configured as a member of VLAN-11. Then PC-1 wants to communicate with PC-2.

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How to Solve the Cloud vs On-Premise Security Dilemma

CATO Networks

Organizations can face challenges moving all their security to the Cloud, particularly when dealing with internal traffic segmentation (East-West traffic protection), legacy data center applications that cant be moved to the cloud, and regulatory issues (especially in Finance and Government sectors). You can also enable tracking (ie.

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CCNA: TCP Three-Way Handshake

The Network DNA

Now actual data transfer happens. Lets say HTTP uses port 80 to identify the application at PC-2, PC-1 chooses Port 80 as the destination port and selects a random port 36000 as the source port. PC-1 and PC-2 both have received and acknowledged a sequence of packets from one another. Continue Reading.

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Strategies for Managing Network Traffic from a Remote Workforce

Kentik

This could mean the users are saturating the internet connectivity or that they’ve saturated the LAN (or maybe WAN). This configuration is known as a “split-tunnel” configuration and is set up by rules to exclude specific ports, protocols, or networks. More advanced VPNs can do this by application type.

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Network Troubleshooting in Depth: A Complete Guide

Kentik

That’s also true for flow data, which summarized packets. Both packets and flows provide information about the source and destination IPs, ports, and protocols. When getting flow data, you’re not as in the weeds as during a packet capture, but it’s good enough for most operational troubleshooting.

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