# \#csp-unit-2-lesson-4 **URL:** https://forum.code.org/tag/csp-unit-2-lesson-4/284.md [Latest](https://forum.code.org/latest.md) · [Categories](https://forum.code.org/categories.md) · [Tags](https://forum.code.org/tags.md) --- ## [Router and/or Switch? (Unit 2 - Lesson 4: Lesson 4: Routers and Redundancy)](https://forum.code.org/t/router-and-or-switch-unit-2-lesson-4-lesson-4-routers-and-redundancy/35140)
**Author:** [@wbarnum](https://forum.code.org/u/wbarnum)\ **Replies:** 2\ **Last updated:** [September 20, 2021, 5:07pm UTC](https://forum.code.org/t/router-and-or-switch-unit-2-lesson-4-lesson-4-routers-and-redundancy/35140 "2021-09-20T17:07:50Z")
Would it be accurate to describe the “routers” in the “Internet Simulator” on Unit 2 - Lesson 4 - Level 1 as acting as both routers and switches? They are connecting one network to another (router) and connecting comput… --- ## [App to demonstrate 12-bit RGB colors](https://forum.code.org/t/app-to-demonstrate-12-bit-rgb-colors/31292)
**Author:** [@alan\_schmitt](https://forum.code.org/u/alan_schmitt)\ **Replies:** 4\ **Last updated:** [October 14, 2019, 9:44pm UTC](https://forum.code.org/t/app-to-demonstrate-12-bit-rgb-colors/31292 "2019-10-14T21:44:38Z")
I noticed some of my students struggling with the 12-bit colors, so I made an app with sliders for R, G, and B that displays the color on a canvas and spells out the 3 hexadecimal digit color code, so they could get a be… --- ## [Hex is not compression](https://forum.code.org/t/hex-is-not-compression/31179)
**Author:** [@mchapman](https://forum.code.org/u/mchapman)\ **Replies:** 0\ **Last updated:** [October 8, 2019, 12:28am UTC](https://forum.code.org/t/hex-is-not-compression/31179 "2019-10-08T00:28:56Z")
My students are still struggling to understand that hex is not compression. I explained that the computer is still using binary, and we aren’t changing the bits at all (as we would do in a compression algorithm), but doe… --- ## [Hexadecimal Color](https://forum.code.org/t/hexadecimal-color/22209)
**Author:** [@anthony\_dellarosa](https://forum.code.org/u/anthony_dellarosa)\ **Replies:** 3\ **Last updated:** [November 16, 2018, 1:42am UTC](https://forum.code.org/t/hexadecimal-color/22209 "2018-11-16T01:42:22Z")
Anyone having trouble explaining the hexadecimal to color activity that was optional? --- ## [Small changes to make a big difference](https://forum.code.org/t/small-changes-to-make-a-big-difference/20511)
**Author:** [@kaitie\_obryan](https://forum.code.org/u/kaitie_obryan)\ **Replies:** 9\ **Last updated:** [October 18, 2018, 3:34am UTC](https://forum.code.org/t/small-changes-to-make-a-big-difference/20511 "2018-10-18T03:34:03Z")
This year I really challenged my students to get creative with this lesson. When ever they asked me if it was “good enough” I said “eh… it would be good to get something extra in there…” a lot of students added shading … --- ## [Lesson 2.4 - Favicon / Steganography](https://forum.code.org/t/lesson-2-4-favicon-steganography/19723)
**Author:** [@derek.babb](https://forum.code.org/u/derek.babb)\ **Replies:** 1\ **Last updated:** [September 20, 2018, 4:37pm UTC](https://forum.code.org/t/lesson-2-4-favicon-steganography/19723 "2018-09-20T16:37:56Z")
I made a favicon to show the Microsoft logo. I like to use this as a way to bring the idea of steganogprahy to students. We talk about how we could “hide” the binary ascii values of a message by modifying the last one … --- ## [Lesson 2.4 Encoding Color Images](https://forum.code.org/t/lesson-2-4-encoding-color-images/15718)
**Author:** [@robgingery](https://forum.code.org/u/robgingery)\ **Replies:** 1\ **Last updated:** [April 23, 2018, 11:28pm UTC](https://forum.code.org/t/lesson-2-4-encoding-color-images/15718 "2018-04-23T23:28:18Z")
My students were still not making the connection between binary and using 1’s and 0’s to make an image. This activity helped them make that connection. --- ## [17-18 Discussion for Lesson 2.4 Encoding Images in Color](https://forum.code.org/t/17-18-discussion-for-lesson-2-4-encoding-images-in-color/9935)
**Author:** [@susan.james](https://forum.code.org/u/susan.james)\ **Replies:** 2\ **Last updated:** [December 5, 2017, 8:09pm UTC](https://forum.code.org/t/17-18-discussion-for-lesson-2-4-encoding-images-in-color/9935 "2017-12-05T20:09:30Z")
Here is my image: Issue I think students will have is discovering that if they are off by one number (type 7 zeros instead of 8, they will get unexpected results from that point on in the image as the rest of the numb… --- ## [Internet simulator?](https://forum.code.org/t/internet-simulator/11207)
**Author:** [@almanm](https://forum.code.org/u/almanm)\ **Replies:** 1\ **Last updated:** [October 19, 2017, 5:10pm UTC](https://forum.code.org/t/internet-simulator/11207 "2017-10-19T17:10:09Z")
You'll forgive me, but this is the first time I've taught this lesson. What version of the internet simulator do students use to "send" their encoded favicon? Thanks. --Matt --- ## ['16-'17 General Discussion for Lesson 2.4](https://forum.code.org/t/16-17-general-discussion-for-lesson-2-4/5153)
**Author:** [@brook](https://forum.code.org/u/brook)\ **Replies:** 31\ **Last updated:** [January 16, 2017, 12:49am UTC](https://forum.code.org/t/16-17-general-discussion-for-lesson-2-4/5153 "2017-01-16T00:49:45Z")
Use this thread to discuss your questions and comments about how to run the lesson. --- ## ['15-'16 Encoding Color Images](https://forum.code.org/t/15-16-encoding-color-images/572)
**Author:** [@jessica\_opaleski\_for](https://forum.code.org/u/jessica_opaleski_for)\ **Replies:** 46\ **Last updated:** [March 17, 2016, 6:25pm UTC](https://forum.code.org/t/15-16-encoding-color-images/572 "2016-03-17T18:25:27Z")
Use this as a space to record your feedback and questions about this lesson.