IPv4 Datagram Header Fields Quiz

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What does a 0 in the first bit of an IP address denote?

Class A network address (correct)

Class B network address

Class C network address

Class D network address

Which type of network address would have a 14-bit netid and a 16-bit hostid?

Class A

Class D

Class C

Class B (correct)

In a class C network address, how many bits are used for the netid?

24 bits

14 bits (correct)

10 bits

7 bits

What do Class D addresses in IPv4 correspond to?

Multicasting for groups across the internet Signup and view all the answers

If a host id is all 0s, what does that imply?

The network specified in the netid Signup and view all the answers

Who assigns the netid in IP addresses?

Internet Corporation for Assigned Names and Numbers (ICANN) Signup and view all the answers

What is the minimum value of the Internet Header Length (IHL) field in an IPv4 datagram?

5 Signup and view all the answers

Which field in an IPv4 datagram is responsible for specifying the protocol of the IP user?

Protocol Signup and view all the answers

What is the purpose of the Type of Service field in an IPv4 datagram?

Specifying precedence, reliability, delay, and throughput Signup and view all the answers

Which field in an IPv4 datagram is decremented by routers to prevent continuously circulating datagrams?

Time-to-live Signup and view all the answers

What is the purpose of the Padding field in an IPv4 datagram?

Ensuring multiple of 32 bits length Signup and view all the answers

Which field in an IPv4 datagram is used for error detection applied at each router?

Header checksum Signup and view all the answers

What is one of the problems associated with NAT?

Unique IP addresses Signup and view all the answers

What is a key feature of ADSL connections mentioned in the text?

Always-on functionality Signup and view all the answers

Why is it problematic if a NAT box crashes?

All TCP connections are lost Signup and view all the answers

Why is combining a NAT box with a firewall important according to the text?

To control incoming and outgoing packets Signup and view all the answers

What is the purpose of 7 NAT, as mentioned in the text?

To resolve problems related to insufficient address space Signup and view all the answers

What does the distance refer to in a distance-vector algorithm?

Number of hops between gateways Signup and view all the answers

What does an address with all 0s in the netid part imply?

The packet is destined for the same network as the source network. Signup and view all the answers

What does an address with all 1s in the whole address (255.255.255.255) mean?

Broadcast over the local network. Signup and view all the answers

Why is the loopback address used?

It represents a special network reserved for testing purposes. Signup and view all the answers

Why do network administrators sometimes disable the broadcast function for all 1s in the hostid part?

To avoid unnecessary network traffic. Signup and view all the answers

In CIDR, how is internet address space assigned?

According to the boundaries between netid and hostid. Signup and view all the answers

Why must each netid have an address mask in CIDR?

To determine the network prefix and host suffix. Signup and view all the answers

What information does each router initially know about?

Netid of networks to which it is attached Signup and view all the answers

How do routers communicate in a Distance-Vector Algorithm (DVA)?

By transmitting the entire contents of their routing table Signup and view all the answers

What happens when a router receives new distance information during the DVA process?

It adds the known distances of its neighbors to its current distances Signup and view all the answers

What is a drawback of a Distance-Vector Algorithm (DVA) in large networks?

High transmission overhead due to sending entire routing tables Signup and view all the answers

In a DVA, how are entries updated in the routing table?

Entries are updated if reported distances are less than current entries Signup and view all the answers

What is stored in a router's adjacency table?

IP/NPA address pairs of other gateways/routers Signup and view all the answers