CN2140 Server II

painveilNetworking and Communications

Oct 24, 2013 (3 years and 9 months ago)

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CN2140 Server II

Kemtis Kunanuraksapong

MSIS with Distinction

MCT, MCITP, MCTS
, MCDST,
MCP, A+


Agenda


Chapter 1: Introduction to Networking Concepts


Exercise


Lab


Quiz

TCP/IP Protocol Suite


Transmission Control Protocol/Internet Protocol


Subnet


Subdividing TCP/IP networks into smaller groupings


Subnet mask


Used to identify which network the TCP/IP host
resides on


Default gateway


Allows a host to communicate with devices that reside
on a remote network or location



IP Addressing


Each IP address consists of two components:


Network address


This portion of the IP address is
shared by all TCP/IP hosts on a particular network
or subnet.


Host address


This comprises the portion of the IP
address that is unique to a particular computer or
host.


Both combined form a unique IP address across
an entire TCP/IP network

IPv4 Addressing


The most commonly used version used today


Based on 32
-
bits (four bytes, or octets)


2
32

(4,294,967,296) possible addresses


IPv4 addresses are commonly represented using
what is called
dotted
-
decimal notation
:


10.27.3.1


192.1.120.84


192.5.18.102

Classful Addressing


Each network class had a different maximum
number of nodes


The first one to four bits identified the network
class, and the remaining bits comprised the
network and host address fields


Class A


Class B


Class C


See Table 1
-
2 and 1
-
3 on Page 4 and 5

Classless Inter
-
Domain Routing (CIDR)


The number of masked bits is specified with the
CIDR notation


Example:


10.0.0.0/8


8 bits masked


24 bits for host numbering

Classless Addressing Examples


15.234.48.34/24


Subnet mask is 255.255.0.0


Network address is 15.234.48.0


Host address is 0.0.0.34


203.23.47.234/16


Subnet mask is 255.255.0.0


Network address is 203.23.0.0


Host address is 0.0.47.234

Subnetting


Logical partitioning of an organization’s network
address range into smaller blocks


Network Address (Enterprise/corporation):


16.52.0.0/16


Site 1 has network address of:


16.52.1.0/24


Site 2 has network address of:


16.52.2.0/24

Subnetting Example


Network Address (Enterprise/corporation):
16.52.0.0/16


Default Subnet mask is 255.255.0.0


Site 1 has network address of:


16.52.1.0


With
subnetting
, the subnet mask becomes
255.255.255.0


Site 2 has network address of:


16.52.2.0


With
subnetting
, the subnet mask becomes
255.255.255.0

Network Address Translation (NAT)


Hosts using private network addresses can
communicate with public networks only by using
network address translation (NAT
)
,


Enables routing by mapping their private
network address to a different, routable network
address.


Loopback Address


Specifies itself at address 127.0.0.1

IPv6 Addressing


IPv6 addresses are 128 bits in length and
expressed in hexadecimal notation


2001:0db8:85a3:08d3:13


19:8a2e:0370:7334


If an IPv6 address contains a series of sequential
zeroes, the address can be shortened


2001:0000:0000:0000:0000:0000:0000:7334


2001:0:0:0:0:0:0:7334


2001::7334

Domain Name System (DNS)


Translates from Host name to IP addresses


HOSTS files also translate from Host name to IP
addresses


See Figure 1
-
1 on Page 7

Traditional Top
-
Level Domain Names


.com


Commercial


.edu


Education


.gov


Agencies of U.S. federal government


.net


Computers of network providers and ISPs


.org


nongovernmental and nonprofit
organizations

Fully Qualified Domain Name (FQDN)


Describes the exact relationship between a host
and its DNS domain


Example:

computer1.sales.adatum.com.


Host name is computer1


In the sales domain, which is in the
adatum

second
-
level domain, which is in the .com top
-
level domain, which is under the “.” root
domain.

Static Addresses


When administering TCP/IP hosts, you can
assign
static IP addresses


Must be
configured and maintained

manually

Dynamic Host Configuration Protocol
(DHCP)


Simplifies the problem by automating the
assigning, tracking, and reassigning of IP
addresses.


Also to provide other important settings such as
the default gateway, subnet mask, DNS, and so
on.


DHCP Relay Agent


See Figure 1
-
2 on Page 11

Dynamic Host Configuration Protocol
(DHCP)


DHCPDISCOVER


DHCPOFFER


DHCPREQUEST


DHCPACK

Network Access Protection (NAP)


Windows Server 2008 provides the Network
Access Protection platform, which provides a
policy enforcement mechanism to control access
to a 2008 network


Quarantine the device such as laptop that does not
have anti
-
virus

Assignment


Summarize the chapter in your own
word


At least 75 words


Due
BEFORE

class
start
on
Thursday


IP Address
subnetting



Due
BEFORE

class
over
on Thursday


Lab 1


Due
BEFORE

class start on
Monday

Assignment


IP Address
Subnetting


For
full credit, you have to
legibly

demonstrate
or illustrate how did you get the answer.


The
correct answer must include


Subnet Mask


Highest and lowest assignable IP
address


IP Address


192.168.30.8/21


10.3.5.1/5


158.10.3.1/14


192.10.1.40/28