Introduction to Distributed Systems EEE466 DA05

1
Introduction to Distributed SystemsEEE466DA05

• Dr Scott Knight
• Royal Military College of Canada
• Electrical and Computer Engineering
• Knight-s_at_rmc.ca
• 1-613-541-6000 ext. 6493

2
References

• Stevens, W.R., TCP/IP Illustrated,
  Addison-Wesley, Ch 10

3
Topics

• Network Principles
• Sub-net design
• Classless inter-domain routing (CIDR)

4
Review

• Explain
• Circuit switching
• Packet switching
• Virtual circuits

5
Networks in the IP Address Space
6
IP Reserved Networks
7
CIDRClassless Inter-domain Routing

• Using CIDR address space is now allocated and
  assigned on bit boundaries (rather than on byte
  boundaries as with class-based routing).
• This means you are able to assign addresses
  corresponding with the number of hosts on the
  network, thereby conserving address space.

8
CIDRClassless Inter-domain Routing

• Consider the following IP address for the
  network 137.94.176.0/22

137.94.177.28
decimal
9
CIDRClassless Inter-domain Routing

• Consider the relationship between a host address
  and the network address

137.94.176.0
8
9
5
E
B
1
1
C
host
1000 1001 0101 1110 1011 0001 0001 1100
host address
22-bit network address
1000 1001 0101 1110 1011 0000 0000 0000
8
9
5
E
B
0
0
0
network
137.94.176.0
10
Exercise Sub-networking

• Provide a network diagram describing the
  following laboratory network for a research group
  at RMC
• The laboratory network has a main router
  connected to the rest of the RMC network the
  router uses a college-side address from an RMC
  sub-network 137.94.176.10/24
• The network administrator has given you the
  137.94.178.0/24 network to use to build the
  laboratory-side of your network.
• In your lab there is a server subnet for a DNS
  Server and a web server the server subnet must
  contain at least 62 unique addresses for
  expansion for future servers.
• There is a laptop subnet for machines that come
  and go from the laboratory the laptop subnet
  must contain at least 62 unique addresses. (show
  at least one machine on your diagram)
• There is an office subnet with several
  workstation computers the office subnet must
  contain at least 126 unique addresses. (show at
  least one machine on your diagram)
• Create an appropriate set of subnets in order to
  implement your office network. On the diagram
  show the following information
• An IP address for each interface (choose
  reasonable ones for those not already given)
• A subnet mask for each subnet
• A network broadcast address for each subnet

11
Exercise Traversing the Network

• Consider the MAC and IP headers as a ping packet
  travels from a machine in the Office sub-net to
  the Web server.

DMZ
DNS
Web
Laptop
Office