Network fundamentals II: Chapter 11

Reasons for Segmenting Networks

-Subnetting reduces overall network traffic and improves network performance. -It can be used to implement security policies between subnets. -Subnetting reduces the number of devices affected by abnormal broadcast traffic.

Which two statements are correct about private IPv4 addresses?

-private IPv4 addresses are assigned to devices within an organization's intranet (internal network) -any organization (home, school, office, company) can use the 10.0.0.0/8 address

Which two situations are the result of excessive broadcast traffic?

-slow network operations -slow device operations

Which two statements are correct about public IPv4 addresses?

-to access a device over the internet, the destination IPv4 address must be a public address. -public IPv4 address exhaustion is a reason why there are private IPv4 addresses and why organizations are transitioning to IPv6.

What is the prefix length notation for the subnet mask 255.255.255.224?

/27

Host-A has the IPv4 address and subnet mask 10.5.4.100 255.255.255.0. What is the network address of Host-A?

10.5.4.0

Host-A has the IPv4 address and subnet mask 10.5.4.100 255.255.255.0. Which of the following IPv4 addresses would be on the same network as Host-A?

10.5.4.1 10.5.4.99

If a network device has a mask of /28, how many IP addresses are available for hosts on this network?

14

Host-A has the IPv4 address and subnet mask 172.16.4.100 255.255.0.0. What is the network address of Host-A?

172.16.0.0

Host-A has the IPv4 address and subnet mask 172.16.4.100 255.255.0.0. Which of the following IPv4 addresses would be on the same network as Host-A?

172.16.4.99 172.16.0.1

Host-A has the IPv4 address and subnet mask 192.168.1.50 255.255.255.0. Which of the following IPv4 addresses would be on the same network as Host-A?

192.168.1.1 192.168.1.100

the subnet mask for prefix /8

255.0.0.0

the subnet mask for prefix /16

255.255.0.0

What subnet mask is represented by the slash notation /20?

255.255.240.0

the subnet mask for prefix /24

255.255.255.0

the subnet mask for prefix /25

255.255.255.128

the subnet mask for prefix /26

255.255.255.192

Which subnet mask would be used if 5 host bits are available?

255.255.255.224

the subnet mask for prefix /27

255.255.255.224

Which subnet mask would be used if exactly 4 host bits are available?

255.255.255.240

the subnet mask for prefix /28

255.255.255.240

the subnet mask for prefix /29

255.255.255.248

the subnet mask for prefix /30

255.255.255.252

A network administrator is variably subnetting a network. The smallest subnet has a mask of 255.255.255.224. How many usable host addresses will this subnet provide?​

30

how many bits is in IPv4 address?

32 bits

How many valid host addresses are available on an IPv4 subnet that is configured with a /26 mask?

62

If a network device has a mask of /26, how many IP addresses are available for hosts on this network?

62

(0.0.0.0/8 to 127.0.0.0/8)

Class A

(128.0.0.0 /16 - 191.255.0.0 /16)

Class B

(192.0.0.0 /24 - 223.255.255.0 /24)

Class C

(224.0.0.0 to 239.0.0.0)

Class D

(240.0.0.0 - 255.0.0.0)

Class E

Used by Windows DHCP clients to self-configure when no DHCP servers are available, Commonly known as the Automatic Private IP Addressing (APIPA) addresses or self-assigned addresses.

Link-Local addresses

Used on a host to test if TCP/IP is operational, Commonly identified as only 127.0.0.1

Loopback addresses

translates private IPv4 addresses to public IPv4 addresses.

Network Address Translation (NAT)

are not unique and can be used internally within any network and are not globally routable

Private IPv4 addresses

are common blocks of addresses used by most organizations to assign IPv4 addresses to internal hosts.

Private addresses

Which organization or group of organizations receives IP addresses from IANA and is responsible for allocating these addresses to ISPs and some organizations?

RIRs

The only device that stops broadcasts is a router.

Switches propagate broadcasts out all interfaces except the interface on which it was received.

ANDing

The actual process used to identify the network and host portion.

IPv4 address is made up of...?

a network portion and a host portion.

What does the IP address 172.17.4.250/24 represent?

host address

A problem with a large broadcast domain?

is that these hosts can generate excessive broadcasts and negatively affect the network.

Which two parts are components of an IPv4 address?

network portion and host portion

Which devices will not forward an IPv4 broadcast packet by default?

router

what is used to determine the network and host portions?

subnet mask

Which statement is true about variable-length subnet masking?

the size of each subnet may be different, depending on requirements.

What is the purpose of the subnet mask in conjunction with an IP address?

to determine the subnet to which the host belongs

Why does a Layer 3 device perform the ANDing process on a destination IP address and subnet mask?

to identify the network address of the destination network

Multicast

transmission is sending a packet to a multicast address group.

Broadcast

transmission is sending a packet to all other destination IP addresses.

Unicast

transmission is sending a packet to one destination IP address.

How many usable IP addresses are available on the 192.168.1.0/27 network?

30

A network administrator subnets the 192.168.10.0/24 network into subnets with /26 masks. How many equal-sized subnets are created?

4