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Q:

Describe the functions of DNS and DHCP in the network?

Answer

Dynamic Host Configuration protocol (DHCP) provides network configuration information (including IP address) to hosts, eliminating the need to perform the configurations manually.


Domain Name Service  (DNS)resolves hostnames - both internet names such as www.routersim.com and device names such as workstation 2 to IP addresses, eliminating the need to know the IP address of a device for connection purposes.

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Subject: CCNA

Q:

Differentiate the DoD and the OSI network models?

Answer

The DoD model is a condensed version of the OSI model, composed of four layers instead of seven, but is nonetheless like the OSI model in that it can be used to describe packet creation and devices and protocols can be mapped to its layers.

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Q:

What is the Class C private IP address space?

Answer

192.168.0.0 through 192.168.255.255

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Q:

What is the Class B private IP address space?

Answer

172.16.0.0 through 172.31.255.255

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Q:

What is the Classs A Private IP address space?

Answer

10.0.0.0 through 10.255.255.255

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Q:

What is the 127.0.0.1 address used for?

Answer

Loop back or diagnostics

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Q:

Which of the following protocols uses both TCP and UDP?

A) FTP B) SMTP
C) Telnet D) DNS
 
Answer & Explanation Answer: D) DNS

Explanation:

DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address.

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Q:

What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?

A) Application B) Host-to-Host
C) Internet D) Network Access
 
Answer & Explanation Answer: B) Host-to-Host

Explanation:

The four layers of the TCP/IP stack (also called the DoD model) are Application/process, Host-to-Host, Internet, and Network Access. The Host-to-Host layer is equivalent to the Transport layer of the OSI model.

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Filed Under: CCNA