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WorksheetsNetwork Layer
Total questions: 15
Worksheet time: 31mins
Which of the following assertions is FALSE about the Internet Protocol (IP) ?
It is possible for a computer to have multiple IP addresses
IP packets from the same source to the same destination can take different routes in the network
IP ensures that a packet is discarded if it is unable to reach its destination within a given number of hops
The packet source cannot set the route of an outgoing packets; the route is determined only by the routing tables in the routers on the way
Which of the following functionalities must be implemented by a transport protocol over and above the network protocol ?
Recovery from packet losses
Detection of duplicate packets
Packet delivery in the correct order
End to end connectivity
The subnet mask for a particular network is 255.255.31.0. Which of the following pairs of IP addresses could belong to this network?
172.57.88.62 and 172.56.87.233
10.35.28.2 and 10.35.29.4
191.203.31.87 and 191.234.31.88
128.8.129.43 and 128.8.161.55
Which of the following is NOT true with respect to a transparent bridge and a router?
Both bridge and router selectively forward data packets
A bridge uses IP addresses while a router uses MAC addresses
A bridge builds up its routing table by inspecting incoming packets
A router can connect between a LAN and a WAN
Packets of the same session may be routed through different paths in:
TCP, but not UDP
TCP and UDP
UDP, but not TCP
Neither TCP nor UDP
The address resolution protocol (ARP) is used for:
Finding the IP address from the DNS
Finding the IP address of the default gateway
Finding the IP address that corresponds to a MAC address
Finding the MAC address that corresponds to an IP address
An organization has a class B network and wishes to form subnets for 64 departments. The subnet mask would be:
255.255.0.0
255.255.64.0
255.255.128.0
255.255.252.0
For which one of the following reasons does Internet Protocol (IP) use the timeto- live (TTL) field in the IP datagram header
Ensure packets reach destination within that time
Discard packets that reach later than that time
Prevent packets from looping indefinitely
Limit the time for which a packet gets queued in intermediate routers.
Two computers C1 and C2 are configured as follows. C1 has IP address 203.197.2.53 and netmask 255.255.128.0. C2 has IP address 203.197.75.201 and netmask 255.255.192.0. which one of the following statements is true?
C1 and C2 both assume they are on the same network
C2 assumes C1 is on same network, but C1 assumes C2 is on a different network
C1 assumes C2 is on same network, but C2 assumes C1 is on a different network
C1 and C2 both assume they are on different networks.
The address of a class B host is to be split into subnets with a 6-bit subnet number. What is the maximum number of subnets and the maximum number of hosts in each subnet?
62 subnets and 262142 hosts.
64 subnets and 262142 hosts.
62 subnets and 1022 hosts.
64 subnets and 1024 hosts.
If a class B network on the Internet has a subnet mask of 255.255.248.0, what is the maximum number of hosts per subnet?
1022
1023
2046
2047
One of the header fields in an IP datagram is the Time to Live(TTL)field. Which of the following statements best explains the need for this field?
It can be used to prioritize packets
It can be used to reduce delays
It can be used to optimize throughput
It can be used to prevent packet looping
Suppose computers A and B have IP addresses 10.105.1.113 and 10.105.1.91 respectively and they both use the same netmask N. Which of the values of N given below should not be used if A and B should belong to the same network?
255.255.255.0
255.255.255.128
255.255.255.192
255.255.255.224
A layer-4 firewall ( a device that can look at all protocol headers up to the transport layer) CANNOT
block HTTP traffic during 9:00PM and 5:00AM
block all ICMP traffic
stop incoming traffic from a specific IP address but allow outgoing traffic to same IP
block TCP traffic from a specific user on a specific IP address on multi-user system during 9:00PM and 5:00AM
A n Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: 245.248.128.0/20. The ISP wants to give half of this chunk of addresses to Organization A, and a quarter to Organization B, while retaining the remaining with itself. Which of the following is a valid allocation of addresses to A and B?
245.248.136.0/21 and 245.248.128.0/22
245.248.128.0/21 and 245.248.128.0/22
245.248.132.0/22 and 245.248.132.0/21
245.248.136.0/24 and 245.248.132.0/21
