Download Chapter 05 Exam Review CCNA Discovery 01 – Computer and

CCNA Discovery 01 – Computer and Network Fundamentals
Presented by:
Phillip Place
Cisco Academy Instructor
Lake Michigan College
Benton Harbor Michigan
On the web: cis140lmc.g-school.net
© 2011 G-Tech Educational Services
How many bits make up an IPv4
Address?
32 Bits
Which portion of an IP address
identifies a specific device?
The host portion.
A host addressed as 172.32.80.22
will belong to what network?
172.32.0.0
What is the subnet mask that
provides the largest number of
hosts?
255.0.0.0
How many bits can be used for a
default class B host IP address?
16 bits
How many IP addresses can be
used on a default class C network?
256
How many host IP addresses are
available in a default class C
network?
254
Using a default mask, what
portion of this address is the
network portion:
175.180.225.193
175.180
In a unicast packet, which type of
destination IP address is used?
A single or specific host
address is used
What does the destination MAC
address look like in a multicast
frame?
It begins with 01:00:5E
What does the destination MAC
address look like in a broadcast
frame?
FF:FF:FF:FF:FF:FF
Give examples of unicast
messages?
Talking on the phone
Ordering food at the drivethru
Passing a note in class
In Ethernet, what must a unicast
message have in order to be
successfully delivered?
A corresponding MAC and IP
address for the destination
host.
In the default DHCP environment,
what happens to an IP address
once the lease expires?
It if returned to the pool of
addresses and can be assigned
to a different host.
What is DHCP?
Dynamic Host Control Protocol
What technology is used to
Dynamically assign network
connection configuration settings
to a host?
DHCP
What are the steps in the DHCP
process?
1.
2.
3.
4.
Host requests an IP address through a
broadcast message to the network
If there is a valid DHCP server on the
network it will reply with an offer
The client send a message back to the DHCP
server accepting the offer
The DHCP server records the MAC and new
IP information and sends confirmation of the
lease to the client
In this diagram, which IP address would the client use as
the default gateway?
10.10.20.254
10.10.20.1
10.10.20.254
200.159.20.1
What are benefits of private
addresses?
• Eases the problem of limited IPv4 public addresses
• Prevents private traffic from being routed publically
• Allows for scalable IP network infrastructure
What are benefits of NAT?
• Prevents external access or detection of internal IP
addressing or systems
• Allows multiple internal systems to share a single public IP
• Eases the problem of limited IPv4 public addresses
• Allows for greater control and filtering of Internet traffic
What network traffic is affected by
NAT?
Only traffic leaving the network is affected
by NAT.
If a network’s router has Network
Address Translation enabled, how
is host to host communication
affected?
It is not so long as that communication
never leaves the network.
What is the IP Class A private
address range?
10.0.0.0 – 10.255.255.255
What is the IP Class B private
address range?
172.16.0.0 – 172.31.255.255
What is the IP Class C private
address range?
192.168.0.0 – 192.168.255.255
What is the default subnet mask
for a Class A network?
255.0.0.0
What is the default subnet mask
for a Class B network?
255.255.0.0
If I were designing a small
network of less than 20 hosts,
what would my IP addresses most
likely look like?
192.168.*.* - Class C Private
You are creating a massive network
with the potential of hundreds of
hosts. Knowing you may need room
for further expansion, what would you
use for the IP addressing?
10.*.*.* - Class A Private
The problem is not physical, yet the
client cannot ping the server. Why?
IP: 192.168.110.35
SM: 255.255.255.0
GW: 192.168.110.254
IP: 192.168.110.254
IP: 192.168.111.34
SM: 255.255.255.0
GW: 192.168.110.254
The server is on the wrong network
Do You Feel Ready?