[Year 12 SofDev] Re: SD VITTA exam 2, multichoice #1

[Mark Kelly]

Ah, but in an election year, the firewall would promise to immediately 
block port 80, but after being elected will instead block port 20 over 4 
years, and only in marginal electorates.

Kevork Krozian wrote:
> Hi James, 
> 
> Your students are right.
> 
>   Not a brilliant question as there are outgoing and incoming ports. A firewall can block incoming and outgoing ports and it is necessary to know which one is required to achieve required results. 
> If a standard install has been used, to browse a web site you need a destination port of 80 to be accessible. To block an incoming port 80 will have no effect on a browser going out to a web site as it will only block incoming requests to an internal web site. When a client browser goes out to a web site the destination port is 80 but the source port is the next available port from 49152 to 65,535. Ports from 1024 to 49151 are registered ports. Ports 1 to 1023 are well known ports and have specific services.
> 
>  If outgoing port 80 is blocked and nothing else has changed ( port on which http protocol is accessed ), then web traffic that uses the http protocol will stop.
> Other traffic that uses different ports such as at the end of the address eg. http://www.xyz.com.au:81 or ftp://ftp.xyz.com.au  or gopher://abc.xyz.com.au, if   supported by the browser in question or any other protocols will still work.
> So the answer should have been written as 
> 
>    B. Can use the browser but web based access of http:// protocol of the internet will stop.
> 
>  (  This is Cisco CCNA Curriculum Semester 2 and also Semester 4 ) . In this time of election advertising, this is written and spoken by Cisco candidate K. Krozian CCNA Melbourne - no affiliation with either the ALP or Liberal parties . 
> 
> Regards
> Kevork
> 
>>>> "James GIBNEY" <jgy at sthelena.vic.edu.au> 18/10/2007 11:12 am >>>
> HI all,
>  
> three has there been some discussion in my class about question 6 in the multiple choice in sample exam 2. I have two students that are adamant that answer B is not entirely incorrect because they say you can still access the internet, web based mail &  FTP sites if port 80 is blocked. 
>  
> Regards
>  
> Jim
>  
> James Gibney
> ICT Coordinator
> St Helena Secondary College
> Wallowa Rd
> Eltham Nth 3095
> Ph 03 94388500
> Fax 03 94388555
> email: jgy at sthelena.vic.edu.au 
> P Please consider the environment before printing this email
> 
> 
> ________________________________
> 
> From: sofdev-bounces at edulists.com.au on behalf of Timmer-Arends
> Sent: Wed 17/10/2007 5:52 PM
> To: Year 12 Software Development Teachers' Mailing List
> Subject: Re: [Year 12 SofDev] Re: SD VITTA exam 2, multichoice #1
> 
> 
> I know it's pedantic but I'm going to write it anyway:
> 
> Kevin wrote:
> All programs can be written using these very simple constructs.
> 1. Sequence 
> 2. Repetition (aka iteration or Loops) 
> 3. Conditional Branching 
> 4. Combined Branching and Repetition 
> 
> Actually only three basic constructs are required to write any program: 1, 2 and 3.
> 4 is composed of two basic constructs (ie 2 and 3)
> 
> And Frank wrote:
> The following implementation of a while loop that Mark Kelly found the other day, which is actually a Repeat..Until loop in your theoretical sense but using different key words, says it all....
> Do
> ..
> Loop While <condition>
> 
> This loop is subly different from a Repeat..Until (and as far as I know only available in MS versions of BASIC). It will execute the body once and then after only WHILE the condition IS TRUE. A Repeat..Until executes the body once and then continues looping UNTIL the condition BECOMES TRUE.
>  
> Personally, I don't think the post-test WHILE (or MS xxxBASIC's pre-test UNTIL) ought ever be shown to students! 
>  
> Regards
> Robert T-A
> Brighton SC
>  
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> 

-- 
Mark Kelly
Manager - Information Systems
McKinnon Secondary College
McKinnon Rd, McKinnon 3204, Victoria, Australia
Direct line / Voicemail: 8520 9085
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