A /27 in CIDR notation is equivalent to which of the following in decimal notation?

A /27 in CIDR notation is equivalent to which of the following in decimal notation?

• 255.255.255.128
• 255.255.255.254
• 255.255.255.248
• 255.255.255.224 

EXPLANATION

There are two parts to an IP address, the network number and the host number. The subnet mask shows what part is which. /27 means that the first 27 bits of the IP address are part of the Network number (192.168.0) the last part is part of the host address (192.168.0.1 - 192.168.0.30).

	Addresses	Hosts	Netmask	Amount of a Class C
/30	4	2	255.255.255.252	1/64
/29	8	6	255.255.255.248	1/32
/28	16	14	255.255.255.240	1/16
/27	32	30	255.255.255.224	1/8
/26	64	62	255.255.255.192	1/4
/25	128	126	255.255.255.128	1/2
/24	256	254	255.255.255.0	1
/23	512	510	255.255.254.0	2
/22	1024	1022	255.255.252.0	4
/21	2048	2046	255.255.248.0	8
/20	4096	4094	255.255.240.0	16
/19	8192	8190	255.255.224.0	32
/18	16384	16382	255.255.192.0	64
/17	32768	32766	255.255.128.0	128
/16	65536	65534	255.255.0.0	256

 

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What are the National Cyber Security Centre guidelines on password Expiry?

What are the National Cyber Security Centre guidelines on password Expiry?

• Don't enforce password expiry
• 30 Days
• 90 Days
• 60 Days 

EXPLANATION

“Change your passwords regularly” is a common piece of password advice, but it isn't necessarily good advice. You shouldn't bother changing most passwords regularly — it encourages you to use weaker passwords and wastes your time. Yes, there are some situations where you'll want to regularly change your passwords.

 Therefore, for decades, many security guidelines have recommended frequent password changes, usually between 30 and 180 days.

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What is the SID for the Domain Admins security group in Active Directory?

What is the SID for the Domain Admins security group in Active Directory?

• S-1-5-21domain-512
• S-1-5-21domain-514
• S-1-5-21domain-513
• S-1-5-21domain-515

EXPLANATION

The SID (Security IDentifier) is a unique ID number that a computer or domain controller uses to identify you. It is a string of alphanumeric characters assigned to each user on a Windows computer, or to each user, group, and computer on a domain-controlled network such as Indiana University's Active Directory

An SID looks like this:

  S-1-5-32-1045337234-12924708993-5683276719-19000

Microsoft usually breaks this down into this pattern:

  (SID)-(revision level)-(identifier-authority)-(subauthority1)-(subauthority2)-(etc)

• SID: The initial S merely identifies the following string as being an SID.
• Revision level: To date, this has never changed and has always been 1.
• Identifier-authority: This is a 48-bit string that identifies the authority (the computer or network) that created the SID.
• Subauthority: This is a variable number that identifies the relation of the user or group described by the SID to the authority that created it. The number tells you:
  • Which computer (or network) created the number
  • Whether this user is a normal user, a guest, an administrator, or part of some other group
  • In what order the user's account was created by this authority (i.e., "This was the first user" or "This is the 231st machine account created".)
  
  This number is also referred to as the "Relative identifier". There can be several subauthorities involved, especially if the account exists on a domain and belongs to different groups.

This security group has not changed since Windows Server 2008.

Attribute	Value
Well-Known SID/RID	S-1-5-<domain>-512
Type	Domain Global
Default container	CN=Users, DC=<domain>, DC=
Default members	Administrator
Default member of	Administrators Denied RODC Password ReplicationGroup
Protected by ADMINSDHOLDER?	Yes
Safe to move out of default container?	Yes
Safe to delegate management of this group to non-Service admins?	No
Default User Rights	See Administrators See Denied RODC Password Replication Group

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Which of the following describes openSUSE?

Which of the following describes openSUSE?

• It is designed to be run one way with little need or capability for customization
• It is free as in free beer, and free as in free speech
• A subscription is required to download software updates
• It is built around propietary software 

EXPLANATION

When there is no difference between the community project and commercial product, the one who pays the bills calls the shots. openSUSE, while sponsored by SUSE, is a relatively independent community. “The community gets to decide what we want in openSUSE.

SUSE Linux. SUSE Linux (/ˈsuːsə/ or /ˈsuːzə/; German: [ˈzuːzə]) is a computer operating system. It is built on top of the free and open source Linux kernel and is distributed with system and application software from other open source projects.

 

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How many user interfaces does YaST have?

How many user interfaces does YaST have?

• 4
• 2
• 5
• 3

EXPLANATION

A feature of YaST is that it contains both Graphical user interface (GUI) and Text-based user interface (TUI) (with ncurses)
front ends. This is especially useful for non-GUI installations such as servers, for system administration over slow Internet connections, and for when one is unable to boot into a graphical X server but still requires an advanced user interface to the package manager (for example, a novice user trying to downgrade an Xorg package to fix a graphical installation).

 

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