Sasaki, Optical Networks 3rd ed.(2010)

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Which IP address is always assigned to a network address?

223.1.9.1 (correct)

223.1.3.27

223.1.1.4

223.1.7.1

In subnetting, what is the purpose of setting host bits to all 0s in a subnet mask?

Creating subnets

Assigning IP addresses to hosts

Identifying the broadcast address

Identifying the network address (correct)

What does a subnet mask do?

Identifies the broadcast address

Separates the IP address into network and host addresses (correct)

Identifies the network address

Assigns IP addresses to hosts

For an ISP wanting to create four subnets from 141.165.34.64/26, what would be the prefix for one of the subnets?

141.165.34.64/28 Signup and view all the answers

When subnetting an IP address space, which address is always assigned to a broadcast address?

223.1.2.2 Signup and view all the answers

Why is having a 'no guarantees' service on the network layer beneficial?

Allows for a simpler implementation of the network layer Signup and view all the answers

What is a key advantage of pushing the implementation of reliable delivery mechanisms to the end systems?

Allows for more innovation and adaptability on the internet Signup and view all the answers

What is the primary aim of IP addressing according to the text?

Assigning IP addresses to computers or devices Signup and view all the answers

What responsibility does forwarding have at the network layer?

Moving packets from router to router Signup and view all the answers

Why is having a reliable and efficient network layer important for data centers and content distribution networks?

To maintain scalability and efficiency Signup and view all the answers

What kind of network would be required in war time historically?

A network with 'no guarantees' service Signup and view all the answers

In the subnetting example provided, what is the prefix for Subnet 2?

141.165.34.96/29 Signup and view all the answers

Based on the ISP's block allocation, what would be the next public IP address after 200.23.16.0/23?

200.23.17.128/23 Signup and view all the answers

What is the total number of subnets created by the ISP from its address space in the provided example?

8 Signup and view all the answers

How many addresses does Subnet 3 require in the subnetting example?

8 Signup and view all the answers

From where do organizations get their pool of public IP addresses according to the text?

They get allocated a portion of their provider ISP’s address space. Signup and view all the answers

How are end hosts like desktops and laptops assigned IP addresses?

Through a process called DHCP where the access routers provide the IP address dynamically. Signup and view all the answers

What is the prefix for Subnet 4 in the subnetting example?

141.165.34.112/29 Signup and view all the answers

What is the main function of access routers in assigning IP addresses?

To implement the DHCP server for dynamic IP address assignment. Signup and view all the answers

Which protocol is involved in assigning IP addresses to end hosts?

DHCP: Dynamic Host Configuration Protocol Signup and view all the answers

What does a DHCP client do when connecting to a network?

It obtains an IP address dynamically from a DHCP server. Signup and view all the answers

Why is dynamic allocation of IP addresses beneficial?

It allows for reuse of IP addresses as machines hold addresses only while connected. Signup and view all the answers

In the DHCP client-server scenario, what is the role of the DHCP server?

Assigns IP addresses dynamically to connecting computers. Signup and view all the answers

What is a key advantage of Network Address Translation (NAT) as mentioned in the text?

It simplifies the process of changing ISPs without changing device addresses. Signup and view all the answers

In a NAT translation table, what information is maintained according to the text?

Mappings between source IP addresses and new port numbers. Signup and view all the answers

What role does a NAT router play in outgoing datagrams according to the text?

It replaces the source IP address and port number with NAT IP address and new port number. Signup and view all the answers

Why do remote clients/servers respond using the NAT IP address and new port number as the destination address according to the text?

To prevent revealing actual IP addresses of internal devices. Signup and view all the answers

Which action does a NAT router take when a reply arrives with a destination address matching its configuration?

It forwards the reply without any modifications. Signup and view all the answers

What purpose does maintaining mappings in a NAT translation table serve as per the text?

To store the correspondence between source IP addresses and new port numbers. Signup and view all the answers

Sasaki, Optical Networks 3rd ed.(2010) - Chapter 5 Quiz

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