Network Layer 1 (Ch. 18-19)
The number of addresses assigned to an organization in classless addressing _______.
must be a power of 2
The network address assigned to an organization _______.
must be evenly divisible by the number of addresses in the block
The CIDR prefix length refers to the number of 1s in the binary format _____________.
network mask
What is the CIDR prefix length equivalent to the default mask of class B networks?
/16
The dotted decimal format network mask of a network is 255.255.192.0. What is the CIDR prefix length?
/18
An organization has been granted a block of IP addresses: 2.2.0.0/20. If the organization needs 16 subnets of equal size, what would be the CIDR prefix length for those subnets?
/24
Which of the following addresses CANNOT be a legitimate network address of a 8-IP address block?
1.2.3.4
If one of the addresses in an IPv4 address block is 12.2.3.7/23, what is the firt IP address in the block?
12.2.2.0
What is the first address of an IPv4 address block if one of the addresses is 12.2.2.76/27 in CIDR notation?
12.2.2.64
What is the broadcast address of an IPv4 address block if one of the addresses is 12.2.2.6/30?
12.2.2.7
Bitwise AND operation is used to extract the network address of an IP address block. What is the result of ANDing 10101010 and 11000000?
128
Bitwise AND operation is used to extract the network address of an IP address block. What is the result of ANDing 10101010 and 11110000? Answer in Decimal.
160
The number of IP addresses that can be assigned to hosts (including routers) in a class C-size IPv4 address block is _______.
254
The prefix length of a network is /24. What is the network mask for the network in the dotted decimal format?
255.255.255.0
An IPv4 address consists of _______ bits.
32
An organization is granted a block of IP addresses; one of the addresses is 2.2.2.64/25. If the organization divides the block into subnets of equal size, and the subnets' CIDR prefix length is /28, what is the number of subnets?
8
Which of the following statements is INCORRECT about datagrams?
Datagrams are used for connection-oriented protocols.
Which of the following statements is CORRECT about IPv4 datagram?
Every IPv4 datagram includes two address fields. The first address field is always for the source address and the second address field is alwasy for the destination address.
Wich of the following statements is INCORRECT about supernetting?
You can supernet 12.34.55.0/24 and 12.34.56.0/24, which will result in 12.34.55.0/23.
IP is _________ protocol.
a best-effort (unreliable)
Which of the following statements is INCORRECT about IPv4 packet structure?
The Identification, Flags and Fragmentation offset fields are used to find the best next hop at each router.
An organization has a /21 network that ends with 12.34.55.255. Which of the following statements is INCORRECT about the network?
The network address of the /21 block is 12.34.40.0
Which of the following statements are true about Internet Protocol (IP)v4?
IPv4 supports header fields error checking.
Which if the following statements is correct about IPv4 datagram fragmentation?
If an IP packet is fragmented, the original Identification field value is copied to all the fragment packets.
When an IP packet is encapsulated in a frame, the total size of the packet, including its header fields, must be smaller than the _______.
MTU
Which of the following statements about Network Address Translation (NAT) is INCORRECT?
NAT gateway replaces the destination IP addresses of outbound (from internal to external host) IP packets.
An organization has an IP address block of 12.34.56.0/22 If you subnet the /22 block into 256-IP address blocks, which of the following statements is INCORRECT about the subnets?
One of the network addresses is 12.34.56.128.
The term ________ means that IP provides no error checking or tracking of its data. IP assumes the unreliability of the underlying layers and does its best to get a transmission through to its destination, but with no guarantees.
best-effort delivery
