Cyber Shiksha Sept 22

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In IPv4, what is the total number of unique IP addresses available?

• 1.28 billion
• 5.56 billion
• 4.3 billion
• 3.9 billion

What is the purpose of the subnet mask in IP addressing?

• It defines the network's physical layout.
• It determines the number of hosts in a network.
• It specifies the default gateway for a network.
• It defines the network portion and host portion of an IP address.

Which class of IPv4 addresses is reserved for multicast groups, allowing data to be sent to multiple recipients simultaneously?

• Class A
• Class B
• Class C
• Class D

Which of the following IP address ranges is reserved for private or internal use within a network and is not routable on the public internet?

• 8.8.8.8
• 192.168.0.0 to 192.168.255.255
• 203.0.113.0 to 203.0.113.255
• 128.100.100.100

When a device is assigned an IP address of 169.254.0.0, what does it indicate?

• device is using APIPA bcoz it couldn't obtain an IP address from DHCP server.
• The device is not connected to any network.
• The device has a static IP address.
• The device is using a public IP address.

In the context of IPv6, what is the purpose of the link-local address?

• It represents the network's external-facing IP address.
• It is used for communication within a specific network segment or link.
• It is used for global internet communication.
• It is a reserved address with no specific purpose.

By default when I create a user, I see that the default shell assigned is /bin/bash. We can change login shell using

• /etc/group
• /etc/passwd
• /etc/shadow
• All

Suppose you have Linux box with IP, "192.168.11.11", and you are able to ssh this node using another Linux box which has IP, "192.168.11.12", BUT you are unable to connect to that node from another Windows Box having IP "192.169.10.29", what could be the problem?

• HARDWARE ISSUE
• PRIVILEGE ISSUE
• DATABASE ISSUE
• CLASS MISMATCH

While attempting to do su (switch user) from one user to another user I get an error message "Authentication failure" and the su fails even when I know I am giving the correct password, which file entry could be possible reason

• /etc/group
• /etc/passwd
• /etc/shadow
• All