TCP/IP Addressing Flashcards
Which TCP/IP setting is not required if you want to communicate on the LAN only?
IP address
Subnet mask
Default gateway
Default gateway
If you want to communicate with systems on the local network, you will not need to configure a default gateway
How many bits in an IP address?
8 bits
32 bits
48 bits
32 bits
An IP address is made up of four 8-bit octets, which gives a total of 32 bits
How many octets in an IP address?
2
3
4
4
An IP address is made up of four 8-bit octets
A computer with a subnet mask of 255.255.255.0 has how many octets for the network ID?
1
2
3
3
A subnet mask of 255.255.255.0 means that the first three octets are part of the network ID and the last octet is the host ID portion of the address
A computer with the IP address of 134.67.89.12 and a subnet mask of 255.255.0.0 is on the same network with which of the following systems?
- 76.89.11
- 67.112.23
- 4.67.34
134.67.112.23
Because the subnet mask is 255.255.0.0, the network ID of the IP address is 134.67.x.y—which means that anyone else with the same first two octets is on the same network
Which network address class supports 65,534 hosts?
Class A
Class B
Class C
Class B
Class B networks support 65,534 hosts because the last two octets are the host ID and each octet supports 256 possible values. 256 × 256 = 65,536—but don’t forget there are two addresses that are unusable (the network ID and the broadcast address)
What is the default subnet mask for a class C network?
- 0.0.0
- 225.0.0
- 255.255.0
255.255.255.0
The default subnet mask of a class C network is 255.255.255.0, which means that the first three octets are the network ID and the last octet is the host ID
Which address is reserved for internal loopback functions?
- 0.0.1
- 0.0.1
- 0.0.1
127.0.0.1
The loopback address is typically known as the 127.0.0.1 address, but it could be any address starting with 127.x.y.z.
What is the well-known port number for the HTTP service?
20
21
80
80
The port used by HTTP is port 80
Which of the following addresses is a private IP address? (Choose all that apply.)
- 0.0.34
- 167.34.5
- 16.7.99
- 108.56.7
- 0.0.34
- 16.7.99
- 0.0.34 and 172.16.7.99 are examples of addresses that fall into the private IP address ranges, which are not routable on the Internet
You are the network administrator for Company XYZ and are required to open a port on the firewall to allow SMTP traffic through. Which port would you open on the firewall?
23
25
443
25
Port 25 is used by SMTP to send e-mail over a TCP/IP network so that is the port you would open on the firewall
What is the subnet mask for 171.103.2.30?
- 0.0.0
- 255.0.0
- 255.255.0
- 255.0.0
171. 103.2.30 is a class B address, so it has a subnet mask of 255.255.0.0
Which network service is responsible for assigning IP addresses to systems on the network when they boot up?
DNS
WINS
DHCP
DHCP
DHCP is responsible for assigning IP addresses to systems automatically so that the network administrator does not have to perform that job manually
Which network service is responsible for resolving (or converting) FQDNs to IP addresses?
DNS
WINS
DHCP
DNS
DNS is used to resolve FQDNs to IP addresses
Bob is having trouble pinging addresses by their FQDN, but he can seem to ping them by their IP address. What should you do to help Bob?
Verify Bob’s WINS setting in TCP/IP.
Verify Bob’s DNS setting in TCP/IP.
Make sure that the system Bob is trying to connect to is in the LMHOSTS file
Verify Bob’s DNS setting in TCP/IP.
If you are having trouble resolving FQDNs to IP addresses, you would make sure that the client is pointing to a valid DNS server in its TCP/IP settings
