Kuis MTCNA 1

How many usable IP addresses are there in a 20-bit subnet?

• 2047

• 2046

• 4096

• 4094

• 2048

Answer explanation

Explanation: A 20-bit subnet leaves 12 bits for host addresses, so 212−2=40942^{12} - 2 = 4094212−2=4094 usable addresses.

You have a router with configuration

- Public IP :202.168.125.45/24

- Default gateway:202.168.125.1

- DNS server: 248.115.148.136, 248.115.148.137

- Local IP: 192.168.2.1/24

Mark the correct configuration on client PC to access to the Internet

• IP:192.168.2.115/24 gateway: 192.168.2.1

• IP:192.168.2.253/24 gateway:202.168.0.1

• IP:192.168.1.223/24 gateway:248.115.148.136

• IP:192.168.2.2/24 gateway:202.168.125.45

• IP:192.168.0.1/24 gateway:192.168.2.1

Answer explanation

Explanation: The gateway should be on the same subnet as the client’s IP.

What protocol does ping use?

• UDP

• TCP

• ICMP

• ARP

Answer explanation

Explanation: The Ping utility uses the ICMP protocol.

In MikroTik RouterOS, Layer-3 communication between 2 hosts can be achieved by using an address subnet of:

• /31

• /32

• /30

• /29

Answer explanation

Explanation: A /30 subnet allows 2 usable IPs, typically for point-to-point communication between hosts.

The basic unit of a physical network (OSI Layer 1) is the:

• Frame

• Bit

• Byte

• Header

Answer explanation

Explanation: The basic unit at the Physical Layer (Layer 1) is the bit.

Which computers would be able to communicate directly (without any routers involved):

• 192.168.0.5/26 dan 192.168.0.100

• 192.168.17.15/29 dan 192.168.17.20/28

• 10.10.0.17/22 dan 10.10.1.30/23

• 10.5.5.1/24 dan 10.5.5.100/25

Answer explanation

Explanation: Both are on the same subnet when using a /24 mask, which allows direct communication.

Which of the following are valid IP addresses?

• 192.168.256.1

• 192.168.13.255

• 1.27.14.254

• 10.10.14.0

Answer explanation

Explanation: These are valid IP addresses. Option A has an invalid octet (256), and D is a network address.

The network address is

• Alamat yang dapat digunakan pertama dari subnet

• Tidak ada yang disebutkan

• Alamat pertama dari subnet

• Alamat terakhir dari subnet

Answer explanation

• Explanation: The network address is the first address in the range, not usable by hosts.

Which of the following is NOT a valid MAC Address?

• 88:0C:00:99:5F:EF

• EA:BA:AA:EE:FF:CB

• 95:B5:DD:EE:78:8A

• 13:16:86:53:89:43

• 80:GF:AA:67:13:5D

Answer explanation

Explanation: "G" is not a valid hexadecimal character, making this an invalid MAC address.

How many layers does Open Systems Interconnection model have?

• 6

• 7

• 9

• 12

• 5

Answer explanation

Explanation: The OSI model consists of 7 layers.