1. ITIS 2110 Class #16
March 13, 2017

2. How difficult was the test (1 easy – 5 extremely difficult)2 3 4 5 29
30 sec countdown

3. To Do HW
Review Test
Lecture

4. HW HW 4 Hints: Due Wednesday!
Hints:
Use the GCC example in the router lecture as a basis
Lecture from class 7

5. Grade Corrections One day “cooling off”
If disagree with point off
Bring substantiation of your point
Text
Authoritative source
Same for grade calculation errors
Check to make sure your grades match
Your calculated
Score on test
Canvas

6. Grade Grade: nn/100 Check your score! Includes bonus and adjustment
nn = 100 – (# wrong) (#bonus )
6 pt adjustment
4 pt for Q45 having error
See discussion
2 pt for Q35 – no-one got right
Check your score!

7. Comments Essay graded on content and how easy to read Deductions:
10 pts discussion of IT Infrastructure
Technical part (T) – n/10
Needed at least discussion of HW and SW
Examples of each
Why it is or is not part
10 was given if above plus a little extra
10 pts for how well written/easily read
Grammatical part (G) – n/10
10 only given for very well written with no spelling or grammar errors
Deductions:
Not in essay format
-3 pts
-n = 20 – (T + S)
Average essay grade was ~17 (-3.2)

8. Statistics Pre-adjustment scores Average 64.9% Mode 59% Median 68% Max
93%
Min
40%

9. Mid-term Exam Grades

10. Questions Missed

11. Notes on Test: Q1 Q5 Q6 Q11 Q15 Hex  6 + Decimal  10  16 symbols
HTTP is stateless Q6
DNS root is ‘.’
Q11
HTTP can use any reliable transport protocol
Q15
TCP and IP are separate (complimentary) protocols

12. Short answer Q16 Q18 Q19 Q22 IZONE????
/27 
 last octet is = = 224
Q19
MAC is 48 bits (64 has also been defined)
Q22
Ask for who has this IP address

13. Short answer Q23 Q25 132.240.10.1 – look at first octet
Class A – 1-126
Class B –
Class C –
Class D –
Class E –
Note 0, 127, and 255 are special
Q25
Bit (Binary Item)

14. Short answer Q26 Q27 Q28 Q29 Names  IP addresses
5 classes, 3 commonly used
Q28
Self, loopback, home, etc
Q29
0  (~65,000)

15. Short answer Q30 Q31 Q32 Q33 Q35 Looking for a Service, not a protocol
WWW, , ftp, etc.
Q31
Firewall: HW or SW or both
Q32
tracert or traceroute
Q33
Command Line Interface
Q35
/27 – leaves 5 for address
32 values
First and last are for wire (network) and broadcast addresses
Leaves 30 for hosts

16. Short answer Match Q41 Q42 Way too many errors! If the NIC is changes
Everyone must be notified
Q42
Discuss the tradeoffs
Class A  few networks, many # hosts
Class C  many networks, few # hosts
Class B  medium networks, medium # hosts

17. Short Answer Q43 Q44 Q45 Class did pretty good overall
Both pass network data
Routers pass if needed
Firewalls block if not wanted
Q44
Who: What:
Owner r-x
Group rwx
Others (all) r--
Q45
Should have been /24 and
152: Class B network subnetted /24  last 8 bits for host
0 = – network address
255 = – broadcast address

18. Essay: IT Infrastructure
Everything needed to support the organization’s operation
Hardware
Software
Human resources
May or may not include some users apps
Example:
Spreadsheet: Is it a critical part of the org?
Yes: needed to do work  it is a part of the infrastructure
No: not needed to do work  it is not a part of the infrastructure

19. Fair Game on End Term Exam
Permissions
Type
Owner
Group
World (All)
Capability
Read
Write
eXecute
Subnet masks
Short notation
e.g. /24 for Class C
How to convert to and from the dotted quad
e.g  /9
Class A, B, C networks
IP ranges
Differences in # of networks
Differences in # of hosts
Network and Broadcast Addresses
Network Address:
All host bits zeroes
e.g /16
Broadcast Address:
All host bits ones
e.g /17
DNS main task
Names  IP

20. Lecture
Mail Servers
Mail Services