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Showing posts with the label CCNA Recap

Route This Way: OSPF

  Something I very recently learned is that routing protocols are learned on Control Planes. Also, welcome to possibly the last post of 2019. I need a break too!  There's plenty more coming in 2020. Meanwhile, visit and follow the new LinkedIn Company Page , if you please.

Route This Way: (E)IGRP

IGRP information is...scant. It's made by Cisco, and they have since moved on to EIGRP. EIGRP talks to its neighbors it knows via the neighbor table. Neighbors are directly connected. The topology table stores routes it learns from its directly connected neighbors  Hellos are sent every few seconds (Depending on Network capability) to make sure the neighbor is still there. A hold time is around 15 seconds. The router will drop the connection if the neighbor doesn't respond. Routers get updates via multicast address

Route This Way: Introduction To Routing Protocols + RIP

Less 'introduction' and more "Well, I paid and studied to take the CCNA, so I'm going to put this information to use somehow." Also, apparently network administrators feel very strongly about their routing protocol of choice, and will fight people over it. Lol. Someone just created a new Twitter account to criticize my view on BGP. Classy! That’s a quick block. — Daniel Dib (@danieldibswe) November 18, 2019 To be clear, I'm 🤔 at the person who went through all that effort to make an account to do this. I have that kind of time as well, but I'm not doing that, I'm doing this. So, what is a Routing Protocol? Graphic Design in My Passion

CCNA Recap: Random Mix of Notes

EMPLOYERS : This is me reviewing information I have been tested on and passed in the past. Install Right to Use License license boot module

CCNA Recap: Hot Standby Routing Protocol (HSRP) Redundance | Load Balancing   for ipv4 hosts default priority for standby routers are 100 Virtual Router Redundancy Protocol is the non cisco proprietary version of HSRP —————   HSRP ——————

CCNA Recap: IPv6

IPv6 Router Solicitation * FF02::2 IPv6 uses an Extension Header. A Router Solicitation w/ IPv6 looks like FF02::2 Valid IPv6 Addresses

CCNA Recap: Wide Area Networks

(More like CCENT Recap) point to point * can be physical * can be logical * typically layer 2 * connect lans to service providers hub and spoke spoke      |      |      | hub ———— spoke   |   |   | spoke

CCNA Recap: Port Security

Trunk ports and Etherchannel ports are not eligible for Port Security. Why? Etherchannel ports are bundled logically to look like one link with larger capacity than a single link. Trunk ports carry all traffic. switchport mode access switchport port-security Port security does not care where frames come from (local device or other switches) Watch incoming frames, keeps list of source MACs & counter of source macs Sticky Secure Mac Addresses Port security learns mac of each port and stores them so you don’t have to put in everyone by hand. Because it's a switch  - Layer 2 - It's all about MAC Addresses.

CCNA Recap: NTP (Network Time Protocol)

This is a new series where I revisit CCNA topics for remembrance and explanation. A mix of old and new notes. There are thousands of NTP servers around the world with access to atomic and GPS clocks (Very precise clocks), synchronised with Coordinated Universal Time. NTP clients initiate a request with a server, and the client updates about once every 10 minutes on port 123. NTP synchronize the clock times on computers and devices within a network. Why is this important? From updates to security (though NTP has its flaws), Timing matters. It's possible to have Time of Day restrictions to network resources. If you receive an alert that someone is on the network after hours, but your time isn't synchronized correctly, how do you know if someone is simply working past clock-out time after being logged in all day, or has truly logged in at 11 PM?