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Question 404 - 312-50v12 discussion

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The network in PLUS company is using the network address 192.168.1.64 with mask 255.255.255.192.

In the network the servers are in the addresses 192.168.1.122, 192.168.1.123 and 192.168.1.124. An attacker is trying to find those servers but he cannot see them in his scanning. The command he is using is: nmap 192.168.1.64/28.

Why he cannot see the servers?

A.
He needs to add the command ""ip address"" just before the IP address
Answers
A.
He needs to add the command ""ip address"" just before the IP address
B.
He needs to change the address to 192.168.1.0 with the same mask
Answers
B.
He needs to change the address to 192.168.1.0 with the same mask
C.
He is scanning from 192.168.1.64 to 192.168.1.78 because of the mask /28 and the servers are not in that range
Answers
C.
He is scanning from 192.168.1.64 to 192.168.1.78 because of the mask /28 and the servers are not in that range
D.
The network must be dawn and the nmap command and IP address are ok
Answers
D.
The network must be dawn and the nmap command and IP address are ok
Suggested answer: C

Explanation:

https://en.wikipedia.org/wiki/Subnetwork

This is a fairly simple question. You must to understand what a subnet mask is and how it works.

A subnetwork or subnet is a logical subdivision of an IP network.The practice of dividing a network into two or more networks is called subnetting.

Computers that belong to the same subnet are addressed with an identical most-significant bit-group in their IP addresses. This results in the logical division of an IP address into two fields: the network number or routing prefix and the rest field or host identifier. The rest field is an identifier for a specific host or network interface.

The routing prefix may be expressed in Classless Inter-Domain Routing (CIDR) notation written as the first address of a network, followed by a slash character (/), and ending with the bit-length of the prefix. For example, 198.51.100.0/24 is the prefix of the Internet Protocol version 4 network starting at the given address, having 24 bits allocated for the network prefix, and the remaining 8 bits reserved for host addressing. Addresses in the range 198.51.100.0 to 198.51.100.255 belong to this network. The IPv6 address specification 2001:db8::/32 is a large address block with 296 addresses, having a 32-bit routing prefix.

For IPv4, a network may also be characterized by its subnet mask or netmask, which is the bitmask that when applied by a bitwise AND operation to any IP address in the network, yields the routing prefix. Subnet masks are also expressed in dot-decimal notation like an address. For example, 255.255.255.0 is the subnet mask for the prefix 198.51.100.0/24.

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asked 18/09/2024
Jacek Kaleta
55 questions
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