Perspectives on IPv4 Subnetting

Question 1

True or False

Addresses in the same subnet are not separated by a router.

Answer 1

True

Question 2

True or False

Addresses in different subnets are separated by at least on router.

Answer 2

True

Question 3

Based on the rules in the book, you should use these rules and plan for one subnet for every?

Answer 3

VLAN
Point-to-Point serial link
Ethernet emulation WAN link (EoMPLS)
Frame Relay PVC

Question 4

_______-______ ______ ______ is the practice of using different masks for different subnets in the same classful IP network.

Answer 4

Variable-length subnet mask (VLSM)

Question 5

What are the solutions that the Internet community came up with during the 1990s to solve the IPv4 addressing issue?

Answer 5

• A new version of IP (IPv6), with much larger addresses (128 bit)
• Assigning a subset of a public IP network to each company, instead of an entire public IP network, to reduce waste
• Network Address Tranlation (NAT), which allows the use of private IP networks.

Question 6

In a Class A network how many bits are dedicated to the Host and Network?

Answer 6

Network Bits = 8

Host Bits = 24

Question 7

In a Class B network how many bits are dedicated to the Host and Network?

Answer 7

Network Bits = 16

Host Bits = 16

Question 8

In a Class C network how many bits are dedicated to the Host and Network?

Answer 8

Network Bits = 24

Host Bits = 8

Question 9

Also called the subnet ID or subnet address, this number identifies the subnet. It is the numerically smallest number in the subnet. It cannot be used as an IP address by a host.

Answer 9

Subnet number

Question 10

Also called the subnet broadcast address or directed broadcast address, this is the last (numerically highest) number in the subnet. it also cannot be used as an IP address by a host.

Answer 10

Subnet broadcast

Question 11

All the numbers between the subnet ID and the subnet broadcast address can be used as a host IP address.

Answer 11

IP addresses

Question 12

What is the subnet planning, design, and implementation tasks?

Answer 12

1. Analyze Needs
   - # Subnets
   - # Hosts/Subnet
   - 1 Size Subnet
2. Design Subnets
   - Choose Network
   - Choose 1 Mask
   - List all Subnets
3. Plan Implementation
   - Subnets–>Locations
   - Static IP
   - DHCP Ranges

Question 13

Host a is a PC, connected to switch SW1 and assigned VLAN 1. Which of the following are typically assigned an IP address in the same subnet as host A? (Select two)

a. The local router’s WAN interface
b. The local router’ s LAN interface
c. All other hosts attached to the same switch
d. Other hosts attached to the same switch

Answer 13

b. The local router’ s LAN interface

d. Other hosts attached to the same switch

Question 14

Why does the formula for the number of hosts per subnet (2^H - 2) require the subtraction of two hosts?

a. To reverse two addresses for redundant default gateways (routers)
b. To reverse the two addresses required for DHCP operation
c. To reverse addresses for the subnet ID and default gateway (router)
d. To reverse addresses for the subnet broadcast address and subnet ID

Answer 14

d. To reverse addresses for the subnet broadcast address and subnet ID

Question 15

A Class B network needs to be subnetted such that it supports 100 subnets and 100 hosts/subnet. Which of the following answers list a workable combination for the number of network, subnet, and host bits? (Select two)

a. Network =16, Subnet = 7, Host = 7
b. Network =16, Subnet = 8, Host = 8
c. Network =16, Subnet = 9, Host = 7
d. Network =8, Subnet = 7, Host = 17

Answer 15

b. Network =16, Subnet = 8, Host = 8

c. Network =16, Subnet = 9, Host = 7

Question 16

Which of the following are private IP networks? (Select two)

a. 172.31.0.0
b. 172.32.0.0
c. 192.168.255.0
d. 192.1.168.0
e. 11.0.0.0

Answer 16

a. 172.31.0.0

c. 192.168.255.0

Question 17

Which of the following are public IP networks? (Select three)

a. 9.0.0.0
b. 172.30.0.0
c. 192.168.155.0
d. 192.1.168.0
e. 1.0.0.0

Answer 17

a. 9.0.0.0
d. 192.1.168.0
e. 1.0.0.0

Question 18

Before Class B network 172.16.0.0 is subnetted by a network engineer, what parts of the structure of the IP addresses in this network already exist, with a specific size? (select two)

a. network
b. Subnet
c. Host
d. Broadcast

Answer 18

a. network

c. Host

Question 19

A network engineer spends time thinking about the entire Class B network 172.16.0.0, and how to subnet that network. He then chooses how to subnet this Class B network and creates an addressing and subnetting plan, on paper, showing his choices. If you compare his thoughts about this network before subnetting the network, to his thoughts about this network after mentally subnetting the network, which of the following occured to the parts of the sturctue of addresses in this network?

a. The subnet part got smaller
b. The host part got smaller
c. The network part got smaller
d. The host part was removed
e. The network part was removed

Answer 19

b. The host part got smaller

Question 20

Which of the following terms are not used to reference the one number in each subnet used to uniquely identify the subnet? (Select two)

a. Subnet ID
b. Subnet number
c. Subnet broadcast
d. Subnet name
e. Subnet address

Answer 20

c. Subnet broadcast

d. Subnet name