If two hosts are connected to a single four port network hub with separate cables, how many collision domains are there?

If two hosts are connected to a single four port network hub with separate cables, how many collision domains are there?

• 4
• 3
• 1
• 2 

EXPLANATION

collisions are a normal characteristic of networks. You cannot stop all collisions from occurring, as that would be unrealistic. A better goal is to try to minimize that number of collisions that take place. To do so, you need to divide your Ethernet segment into smaller collision domains, which will result in fewer hosts per collision domain. To accomplish this, you have to use a switch. Every switchport has its own collision domain. This means that if you connect, for example, four hosts to four different switchports, you will have four collision domains

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Which type of connection should a straight-through cable be used for?

Which type of connection should a straight-through cable be used for?

• Switch to router
• Switch to hub
• Switch to switch
• Hub to hub 

EXPLANATION

To specify when we use crossover cable or straight-through cable, we should remember:
Group 1: Router, Host, Server
Group 2: Hub, Switch
One device in group 1 + One device in group 2: use straight-through cable
Two devices in the same group: use crossover cable
In this case we can use straight-through cable to connect a switch to a router -> is correct.

 

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What is the network address of 192.168.1.135/28 ?

What is the network address of 192.168.1.135/28 ?

• 192.168.1.128
• 192.168.1.143
• 192.168.1.127
• 192.168.1.144 

EXPLANATION

The number 28 means the subnet mask off that IP address is 255.255.255.248 meaning this IP address belongs to a subnet of block size 16.

	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 is a collection of Microsoft Domains commonly called?

What is a collection of Microsoft Domains commonly called?

• An orchard
• A collection
• A mess
• A forest 

EXPLANATION

A Windows domain is a form of a computer network in which all user accounts, computers, printers and other security principals, are registered with a central database located on one or more clusters of central computers known as domain controllers. Authentication takes place on domain controllers.

An Active Directory domain is a collection of objects within a Microsoft Active Directory network. An object can be a single user or a group or it can be a hardware component, such as a computer or printer. Each domain holds a database containing object identity information.

Active Directory domains are grouped in a tree structure; a group of Active Directory trees is known as a forest, which is the highest level of organization within Active Directory. Active Directory domains can have multiple child domains, which in turn can have their own child domains. Authentication within Active Directory works through a transitive trust relationship.

 Active Directory domains can be identified using a DNS name, which can be the same as an organization's public domain name, a sub-domain or an alternate version (which may end in .local).  While Group Policy can be applied to an entire domain, it is typical to apply policies to sub-groups of objects known as organizational units (OUs). All object attributes, such as usernames, must be unique within a single domain and, by extension, an OU.

 

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Which of the following is a DOS device driver that allows DOS programs to store data in extended memory via XMS?

Which of the following is a DOS device driver that allows DOS programs to store data in extended memory via XMS?

• EMM386
• UMA
• HIMEM.SYS
• KMDF 

EXPLANATION

SYS is a DOS device driver which allows DOS programs to store data in extended memory via the Extended Memory Specification (XMS). This device driver is of particular importance because various versions of Microsoft Windows that ran on top of the DOS operating system required HIMEM. SYS to be loaded to be able to run.

HIMEM. SYS is a DOS device driver which allows DOS programs to store data in extended memory via the Extended Memory Specification (XMS). This device driver is of particular importance because various versions of Microsoft Windows that ran on top of the DOS operating system required HIMEM.

 

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