What does the acronym HIDS denote?
host-based intrusion detection system
What is the purpose of NAC? Network Access Control (NAC) ensures that the computer on the
network meets an organization's security policies.
What does the acronym POP denote?
Post Of
Hypervisor
This is the Virtual Machine Manager that handles the relationship between the
physical computer with the virtual computer.
Software as a Service (SaaS) Cloud Service
Ondemand software, no local installation.
Central Managment of data and apps.
Source: http:/www.geekgirls.com/databases_from_scratch_1.htm
Databases from scratch I: Introduction
The first in a series of articles on choosing, designing and using a database program.
When I was eighteen, I had a holiday job in an obscure back office o
CSIS3155 RSA Example
RSA involves a public key and a private key. The public key can be known by everyone and is
used for encrypting messages. Messages encrypted with the public key can only be decrypted in
a reasonable amount of time using the private ke
TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.
1)
Public-key encryption is also referred to as conventional encryption, secret-key, or single-key encryption.
1)
_
2)
The advantage of a block cipher is that you can reuse
Key Generation
p and q both prime, p q
Select p, q
Calculate n = p q
Calculate (n) = (p 1)(q 1)
Select integer e
gcd(n), e) = 1; 1 < e < (n)
Calculate d
de mod (n) = 1
Public key
KU = cfw_e, n
Private key
KR = cfw_d, n
Encryption
Plaintext:
M<n
Ciphertext
Network Security: Top 5 Fundamentals
by Megan Berry
http:/www.itmanagerdaily.com/network-security-fundamentals/
Relentless cyber criminals, disgruntled current and former employees and careless users can bring down your computer networks
and compromise da
Distribution System
AP 2
AP 1
Basic Service
Set (BSS)
Basic Service
Set (BSS)
STA 1
STA 8
STA 2
STA4
STA 6
STA 3
Figure 7.5 IEEE 802.11 Extended Service Set
STA 7
Remote
users
Internet
Boundary
router
Internal DMZ network
Web
server(s)
Email
server
DNS
server
Internal protected network
Application and database servers
External
firewall
LAN
switch
Internal
firewall
LAN
switch
Workstations
Figure 12.2 Example Firewal
1. The most widely accepted and implemented approach to public-key encryption, _ is
a block cipher in which the plaintext and ciphertext are integers between 0 and n - 1 for
some n.
RSA
2. The purpose of the _ algorithm is to enable two users to excha
Kwan Yui Wong (Jason)
301152139
[email protected]
Assignment 1
3a. Circuit switching network is more appropriate because the connect runs for a
relatively long period. Also the application transmits data at steady and known, it is
possible to reserve enough ban
Kwan Yui Wong (Jason)
301152139
[email protected]
Assignment 1
3a. Circuit switching network is more appropriate because the connect runs for a
relatively long period. Also the application transmits data at steady and known, it is
possible to reserve enough ban
Q1: True or False
(1a) To send an email, the senders email client will contact the recipients mail server,
which will then push the email into the recipient's local mailbox via SMTP.
(2b) The HTTP protocol is stateful and it uses the cookie technolo
CCNPv7 ROUTE
2014 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public.
Page 1 of 13
CCNPv7 ROUTE
Lab 3-1, OSPF Virtual Links
Chapter 3 Lab 3-1, OSPF Virtual Links
Topology
Objectives
Configure multi-area OSPF on a router.
Veri
Mei Qin Chen
citadel-math231
WeBWorK assignment number Homework16 is due : 10/28/2011 at 10:00am EDT.
The
(* replace with url for the course home page *)
for the course contains the syllabus, grading policy and other information.
This file is /conf/snippe
snick
snack
CPSC 121: Models of Computation
2009 Winter Term 1
Sequential Circuits (Mealy Machines)
Steve Wolfman, based on notes by
Patrice Belleville and others
1
Outline
Prereqs, Learning Goals, and !Quiz Notes
Problems and Discussion
A Pushbutton L
snick
snack
CPSC 121: Models of Computation
2011 Winter Term 1
Number Representation
Steve Wolfman, based on notes by
Patrice Belleville and others
1
Outline
Prereqs, Learning Goals, and Quiz Notes
Prelude: Additive Inverse
Problems and Discussion
Clo
snick
snack
CPSC 121: Models of Computation
2011 Winter Term 1
Number Representation
Steve Wolfman, based on notes by
Patrice Belleville and others
1
Outline
Prereqs, Learning Goals, and Quiz Notes
Prelude: Additive Inverse
Problems and Discussion
Clo
snick
snack
CPSC 121: Models of Computation
2010 Winter Term 2
Introduction to Induction
Steve Wolfman
1
Outline
Prereqs, Learning Goals, and Quiz Notes
Problems and Discussion
Single-Elimination Tournaments
Binary Trees
A First Pattern for Induction
1. First we must note that after the first packet reaches to the first router,
the second packet will be sent, and after the second packet reaches to
first router the third one will be sent.
For the first packet to reach the first router we have:
Propagat
CMPT-371, Assignment-2 Solutions
1. The only side eect of having such channel is increased congestion. The
operation of the Go-Back-N protocol will not be aected. Duplicate
packets will be discarded/ignored at the receiver since they will be
out-of-order.
CMPT 371, Fall 2013 Midterm
1. (20 pts) Suppose we have a TCP connection with a bandwidth of B
Kbit/sec each way, with an RTT of 0.5 seconds and no dropped/delayed
packets. The sender and receiver each have a window of size N (dont
worry about types of wi
CMPT-371, Assignment-3 Solutions
1. In the following graph. The minimum spanning tree (MST) includes
edges (s,a) and (a,b) with a total cost of 2. While the RPF tree include
edges (s,a) and (s,b) with a total cost of 10. Your answer may vary.
s
1
9
1
a
b
CMPT-371, Assignment-4 Solutions
1. All nodes will attempt to transmit at t = 1. Therefore, collision will
occur and no one succeeds. At t = 3, at most two nodes would succeed to transmit. Hence, it is impossible that all nodes would have
successfully tra
CMPT 371: Homework Assignment 4
1. Construct a network with the following properties: The links have symmetric costs in both directions. There is a node s such that the total
cost of the RPF broadcast tree rooted at s is ve times that of the
minimum spann
CMPT 371: Homework Assignment 1
1. I would like to send three packets, of size 1500 bytes each, from point
A to point B. A is connected to Router 1 with a link of lenght l1 meters
and bandwidth b1 bytes/s. Router 1 is connected to Router 2 with a
link of
CMPT 371: Homework Assignment 2
1. Consider a channel that can somehow duplicate a packet (ie, you send
packet x, and another copy of x can be generated without you knowing.
This can happen to ACKs as well. Is this a problem? You can assume
that we are us
CMPT 371: Midterm
1. Give short answers.
(a) In go-back-N the senders and the receivers windows must be the
same size. True of false? .
(b) In the alternating bit protocol the size of the sequence space
is.
(c) . is a mechanism in TCP for preventing the s
CMPT 371: Homework Assignment 4
1. Consider slotted ALOHA. At time t = 0 3 nodes become ready to send a
frame. Let p = 1/2. What is the probability that at time t = 3, that is,
three time slots later, all of them have transmitted successfully? What
is the