# Transparent Cisco IOS Firewall

**URL:** https://forum.networklessons.com/t/transparent-cisco-ios-firewall/1027
**Category:** Lessons Discussion
**Created:** [December 26, 2016, 6:20pm UTC](https://forum.networklessons.com/t/transparent-cisco-ios-firewall/1027 "2016-12-26T18:20:59Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![lagapidis](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/lagapidis/32/4949_2.png) [@lagapidis](https://forum.networklessons.com/u/lagapidis)
#### Post date: [August 29, 2018, 6:33am UTC](https://forum.networklessons.com/t/transparent-cisco-ios-firewall/1027/6 "2018-08-29T06:33:00Z")

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Hello Vittawat

> [@titikaka\_awake](#):
>
> According wording “This means that R1 and R3 will be in the same layer 2 domain.” , it mean if Braodcast strom happen from R1 then it effect with R3 right ?

Yes that is correct. In the specific topology, R2 would essentially function as a switch so any broadcasts sent on Fa0/0 of R1 would reach the Fa0/0 interface of R3.

Now as for your question about limiting broadcast storms, for a topology similar to that in the lesson, a broadcast storm would not be a possibility. This is because there are only two hosts in the link, R1 and R3. A broadcast storm is a concern only when there are tens or even hundreds of devices within the same broadcast domain. Typically when you configure a router to function as a layer two bridge, you wouldn’t connect it to a LAN with many devices, but it would most likely be a point to point connection, so no storm control configurations need be implemented.

I hope this has been helpful!

Laz

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