- Input and Output redirection and Pipes. How do you do Input redirection? How do you do output redirection? How do you pipe the output of one Unix or Linux or DOS Prompt (Command Prompt) command to be the input to another command.
C:\>help find
Searches for a text string in a file or files.
FIND [/V] [/C] [/N] [/I] [/OFF[LINE]] "string" [[drive:][path]filename[ ...]]
/V Displays all lines NOT containing the specified string.
/C Displays only the count of lines containing the string.
/N Displays line numbers with the displayed lines.
/I Ignores the case of characters when searching for the string.
/OFF[LINE] Do not skip files with offline attribute set.
"string" Specifies the text string to find.
[drive:][path]filename
Specifies a file or files to search.
If a path is not specified, FIND searches the text typed at the prompt
or piped from another command.
C:\> assoc | find /c "="
880
C:\> assoc | find /I "flash"
.as=Flash.ActionScriptFile
.asc=Flash.ASCommunicationFile
.clr=Flash.ColorTableFile
.fla=Flash.Movie
.flp=Flash.FlashProjectFile
.flv=FlashVideo.FlashVideo
.jsfl=Flash.JSCommandFile
.mfp=MacromediaFlashPaper.MacromediaFlashPaper
.spa=Flash.Movie
.spl=ShockwaveFlash.ShockwaveFlash
.swc=Flash.FlashComponentFile
.swd=Flash.DebugFile
.swf=ShockwaveFlash.ShockwaveFlash
.swt=ShockwaveFlash.ShockwaveFlash
458 finger
459 finger | wc PIPE symbol and PIPE operation
460 man wc
461 man wc man wc = show the manual pages for wc command
462 finger | wc
463 finger | wc pipe the output of finger command to the wc command
464 finger to get the count of lines, words, and characters.
465 finger > march31st.txt redirect the OUTPUT to a file named march31st.txt
472 bc < bc.txt Redirect the INPUT to be from file named bc.txt
473 bc < bc.txt > bcOutput.txt Redirect both the INPUT and the OUTPUT
474 more bcOutput.txt Look at the output file that bc > bcOutput.txt created.
475 history
476 bc < bc.txt | wc Input from bc.txt and Output piped to wc program.
bash-2.05$ cat kidsInTheCar.txt | spell | sort TWO PIPES and 3 programs (cat 1st, then spell, then sort)
annd --- ----- ----
arre
booy
da
girll
bash-2.05$ cat kidsInTheCar.txt | spell | sort | wc Using 3 pipes and FOUR programs!
5 5 24
- Bridges and Switches: Filter or Forward or Flood. Physical addresses (MAC or NIC or NAC addresses). The Network Interface Card, the Network Adaptor Card, the 48 bit or 6 byte Media Access Control MAC or NIC or NAC address. Also known as the Physical Address. Switches and whether to FLOOD or to FORWARD or to FILTER a packet that arrives at the switch. ARP = Address Resolution Protocol. What does an ARP request obtain? What does it already know before getting the REPLY? What does it need to know or obtain?
- TIC - Tiny Imaginary Computer - question similar to quiz one. See quiz one and the quiz one study guide.
6. TIC - Tiny Imaginary Computer. <----- From quiz one study guide...
You would be given the Table 7.1 TIC Operation Codes. The quiz
will require you to do a problem like you did for HW and like
you did as group exercise in class and like was demonstrated
and traced in class.
http://www.cs.uni.edu/~jacobson/23/spr11/TICgroupExercise.pdf
http://www.cs.uni.edu/~jacobson/23/spr11/emailSpr11d.txt
And like was done on QUIZ ONE before SPRING BREAK and reviewed in class
after spring break when that page of the quiz was handed back.
If you got 0 out of 8 points on the TIC portion of the quiz, you should
have extensive notes that you took on the day that question
was reviewed. (In an ideal world, anyway).
- Subnet masks and IP numbers. You will have a question like the following example to test your understanding
of subnet masks.
UNI currently has IP address 134.161.0.0 for the uni.edu domain. The subnet mask that UNI
currently uses is 255.255.128.0 which means UNI only is broken up into TWO subnetworks.
Quiz practice question:
12. Suppose that the subnet mask for the middleearth.com domain is:
255.255.240.0 255.255.240.0
Group all of the following IP numbers for the named computers
into groups that are on the same subnet.
144.154.31.44 Merry.middleearth.com
144.154.16.2 Aragorn.middleearth.com
144.154.16.3 Gimli.middleearth.com
144.154.220.111 Frodo.middleearth.com
144.154.100.111 Bifur.middleearth.com
144.154.213.111 Bilbo.middleearth.com
144.154.125.111 Bofur.middleearth.com
144.154.223.111 Gollum.middleearth.com
144.154.111.111 Strider.middleearth.com
144.154.208.222 Gandalf.middleearth.com
144.154.16.4 Legolas.middleearth.com
144.154.17.4 Samwise.middleearth.com
144.154.19.4 Boromir.middleearth.com
144.154.244.244 Sauron.middleearth.com
You can just mention the computer name when you do the grouping,
and avoid writing the .middleearth.com every time.
Study and Review SUBNET MASKing concepts here.
- Wireshark material and the P D N T S P A OSI 7 layer model compared to the 4 layer TCP/IP model of networks. You have seen PORT numbers, IP addresses, Physical (MAC, NIC, NAC) addresses in actual network packet traffic now. WIRESHARK review and networking basics page.
- Thursday, March 10th, 2011 review of subnet masks and preview of wireshark network analysis software, etc.
- VIP: email023March29th2011.txt - the hints and metaphors and analogies should be understood.
- How
Encapsulation Works in TCP/IP - look at the 7
layer
model and
the 4 layer model side by side. One computer requests. One computer
receives. Five steps to the Data Encapsulation Process.