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Course 4

Terms in this set (78)

1. Which of the following protocols work at IP layer?

ICMP
ARP
IGMP
All of the above
All of the above
2. Which of the following packet header length cannot be used in an IPv4 packet header?

20 Bytes
30 Bytes
60 Bytes
64 Bytes
30 bytes
3. How many bits used for header checksum in IPv4 packets?

8 bits
16 bits
32 bits
None of the above
16 bits
4. What is the dotted notation of an IP address of 10000000 10000111 01000100 00000101 ?

128.133.68.5
128.135.68.5
128.135.65.5
128.135.65.5
128.135.68.5
5. Given a network address 128.100.0.0, what is its network class type?

Class A
Class B
Class C
None of the above
Class B
6. Which of the following is provided at the IP layer

Connectionless
Best effort delivery service
Both of the above
None of the above
Both of the above
7. You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which will be your closest choice

255.255.255.224
255.255.255.192
255.255.255.240
255.255.255.248
255.255.255.224
8. What is the subnetwork number of a host with an IP address of 172.16.66.0/21

172.16.48.0
172.16.64.0
172.16.0.0
172.16.36.0
172.16.64.0
9. What is the first valid host on the subnetwork that the node 172.30.190.198/24 belongs to?

172.30.190.0
172.30.190.1
172.30.190.100
None of the above
172.30.190.1
10. Based on 1.1.1.0/24, the IP address would be:

Class A
Class B
Class C
Class D
Class A
1. Which of following is the range of IPv4 addresses spanned by Class C?

1.0.0.0 to 127.255.255.255
128.0.0.0 to 191.255.255.255
192.0.0.0 to 223.255.255.255
None of the above
192.0.0.0 to 223.255.255.255
2. If a subnet needs to accommodate up to 500 hosts. How many bits for HostID would be sufficient?

8
9
7
5
9
3. Consider a Class B network, where the subnet ID takes 9 bits. What will be the subnet mask?

11111111 11111111 11111110 00000000
11111111 11111111 11111111 10000000
11111111 11111111 00000000 00000000
None of the above
11111111 11111111 11111111 10000000
4. Given a subnet mask 255.255.255.240, how many hosts the subnet can support?

14
30
62
None of the above
14
5. A host in an organization has an IP address 150.32.64.34 and a subnet mask 255.255.240.0. What is the address of this subnet?

150.32.64.24
150.32.64.0
150.32.64.32
150.32.64.16
150.32.64.0
6. What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask

14
15
30
62
30
7. When calculating usable hosts per subnet, the following formula is used 2^bits - 2. For what reason is two subtracted? (choose two)

Broadcast
Multicast
Network
Unicast
Broadcast
Network
8. How many hosts can be addressed on 10.0.0.0/16?

16
254
65536
65534
65534
9. Which of the following is a valid IP host address given the network ID of 191.254.0.0 while using 11 bits for subnetting?

191.254.0.96
191.54.1.64
191.254.1.29
191.254.0.32
191.254.1.29
10. DISCO Corporation has been assigned the Class B network address 165.87.0.0. DISCO needs to divide the network into eight subnets. What subnet mask should be applied to the network to provide the most hosts per subnet?

255.255.240.0
255.255.224.0
255.255.248.0
255.255.192.0
255.255.240.0
1. Which class of IP addresses does CIDR performs aggregation on?

Class B
Class C
Class A
Class D
Class C
2. Using a CIDR notation, a prefix 205.100.0.0 of length 22 is written as 205.100.0.0/22. What network mask that the /22 notation indicates?

205.255.255.0
255.255.252.0
255.255.22.0
None of the above
255.255.252.0
3. Perform CIDR aggregation on the following /24 IP addresses: 128.58.24.0/24, 128.58.25.0/24, 128.58.26.0/24, 128.58.27.0/24. What is the CIDR outcome?

128.58.28.0/22
128.58.24.0/22
128.58.28.0/24
None of the above
128.58.24.0/22
4. Which protocol provides conversion from an IP address to a physical address?

ARP
ICMP
DNS
IGRP
ARP
5. Which protocol is used to assign temporary IP addresses to hosts?

ICMP
DHCP
ARP
None of the above
DHCP
6. In order to maximize the usage of limited IP addresses, which of the following protocol is commonly used

NAT
DHCP
Both of the above
None of the above
Both of the above
7. The internet protocol allows IP fragmentation so that datagrams can be fragmented into pieces small enough to pass over a link with a smaller MTU than the original datagram size

True
False
True
8. Which of the following statement is correct for IPv6

Addresses are not hierarchical and are randomly assigned
Broadcast in IPv4 have been replaced with multicast in IPv6
There are 2.7 billion available addresses
Does not support multiple multiple IPv6 address per interface
Broadcast in IPv4 have been replaced with multicast in IPv6
9. Bootstrap Protocol (BOOTP) allows a diskless workstation to be remotely booted up in a network with TCP port designation for both client and server

True
False
False
10. In NAT operations, which of the following statements are correct (Select 3)

Hosts inside private networks generate packets with private IP address and TCP/UDP port numbers
Translation table allows packets to be routed ambiguously
NAT maps each private IP address and port number into shared global IP address and available port number
Translation table allows packets to be routed unambiguously
Translation table allows packets to be routed unambiguously;
NAT maps each private IP address and port number into shared global IP address and available port number;
Hosts inside private networks generate packets with private IP address and TCP/UDP port numbers;
1. Packet is to be forwarded to a network with MTU of 592 bytes. The packet has an IP header of 20 bytes and a data part of 1484 bytes. Which of following maximum data length per fragment is legitimate?

572
568
562
592
568
2. What information is used as the entry of the lookup table in a Network Address Translation box?

All of the above
IP address
TCP port number
UDP port number
All of the above
3. IPv6 allows fragmentation at

Source only
Intermediate routers only
Both source and intermediate routers
None of the above
Source only
4. Which of following fields that IPv6 dropped from IPv4?

Header checksum
All of the above
Header length
ID/flags/frag offset
All of the above
5. in practical IPv6 application, a technology encapsulates IPv6 packets inside IPv4 packets, this technology is called

Network address translation
Dynamic host configuration protocol
IP tunneling
All of the above
IP tunneling
6. Which fields in IP packet provide for fragmentation of datagrams to allow differing MTUs in the internet (select 3 answers)

Flags
Type of service
Identification
Fragmentation offset
Identification;
Flags;
Fragmentation offset
7. IPv6 has a much larger space of

2^8
2^16
2^32
2^128
2^128
8. Which of these statements are true of IPv6 representation
(select 2 answers)

Every IPv6 interface contains at least one loopback address.
A single interface may be assigned multiple IPv6 addresses of any type.
Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.
The first 64 bits represent the dynamically created interface ID.
Every IPv6 interface contains at least one loopback address;
A single interface may be assigned multiple IPv6 addresses of any type
9. Which of the following statement is true for DHCP

Used extensively to assign temporary IP addresses to hosts
Allows ISP to maximize usage of their limited IP addresses
Time threshold to enforce lease time
All of the above
All of the above
10. In Network Address Translation (NAT), which of the following statement is true for a packet with an associated private IP address at the routers in the global internet

Forwarded to the destination address in the packet header
Discarded due to the nature of the packet address
Create an exception and then forward the packet to the destination address in the header
Redirected to other routers for address confirmation
Discarded due to the nature of the packet address
1. Which of following control is enabled in UDP?

Flow control
Error control
Congestion control
None of the above
None of the above
2. Which of following information is not used in UDP de-multiplexing?

Destination port number
Source IP address
Source port number
Destination IP address
Source port number
3. TCP adopts selective repeat ARQ protocol for flow control. In TCP flow control implementation, the window slides at

Per-packet basis
Per-byte basis
Per-bit basis
None of the above
Per-byte basis
4. Which flag bit in TCP header must be set when a TCP client initiates a three-way handshake?

SYN
ACK
RST
None of the above
SYN
5. TCP adopts selective repeat ARQ protocol for flow control. In TCP flow control implementation, the window slides at

FIN
RST
ACK
SYN
FIN
6. In Transmission Control Protocol (TCP), When a segment carries a combination of data and control information, it uses a

Slot Number
Sequence Number
Source Number
Port Number
Sequence number
7. Transmission Control Protocol (TCP), has same Checksum controlling like

TCP/IP
UDP
IP
ICMP
UDP
8. In TCP connection management, which of the following statements are true (select 2 answers)

Select initial sequence numbers (ISN) to protect against segments from prior connections.
High bandwidth connection pose a problem.
Use global clock to select ISN sequence number.
Time for clock to go through a full cycle should be less than the maximum lifetime of a segment.
Select initial sequence numbers (ISN) to protect against segments from prior connections;
High bandwidth connection pose a problem
9. In phases of congestion behavior, when arrival rate is greater than outgoing line bandwidth

Light traffic
Congestion onset
Knee
Congestion collapse
Congestion collapse
10. Which of the following services are provided by UDP

IP
De-multiplexing
Error Checking
All of the above
All of the above
1. When a TCP client initiates a three-way handshake with a sequence number x, what will be the acknowledgement number when the TCP server replies?

x
x + 1
x + y (where y is the sequence number proposed by TCP server)
None of the above
X + 1
2. TCP header has a field called window size. What value is the value window size set to?

Advertised window size for congestion control
Round-trip delay
Advertised window size for flow control
None of the above
None of the above
3. In general, there are three phases of congestion behavior, i.e., light traffic, knee, congestion collapse. Which phase does TCP congestion avoidance maps to?

Light traffic
Knee
Congestion collapse
None of the above
Knee
4. When three duplicate acknowledgements arrive before timeout expires, what will TCP congestion control algorithm reset congestion threshold to for fast re-transmission and fast recovery?

Reset congestion threshold to 1
Reset congestion threshold to half of the current congestion window size
Reset congestion threshold to the current congestion window size
None of the above
Reset congestion threshold to half of the current congestion window size
5. Assume a TCP source writes a 1200-byte message in one write. Which of following is possible forthe destination to receive the message?

It receives two reads of 600 bytes each
It receives three reads of 400 bytes each
All of the above
It receives a 1200-byte message in one read
All of the above
6. The process of combining multiple outgoing protocol streams at the Transport and Network layers in TCP/IP is called Multiplexing

True
False
True
7. TIMELY provides a framework for rate control that depends on transport layer protocol for reliability

True
False
False
8. The operation of TCP congestion control can be divided into three phases, which phase requires that the congestion window size be increased by one segment upon receiving an ACK from receiver

Congestion avoidance
Slow start
Congestion
None of the above
Slow start
9. In a router, the control of the transmission rate at the sender's side such that the router's buffer will not be over-filled is called _________ if sender is transmitting too fast

Network under-utilization
Host flooding
Network congestion
None of the above
Network congestion
10. Congestion control is associated with the window size field

True
False
False
1. Which of following protocol allows a host to signal its multicast group membership to its attached routers?

ICMP
IGMP
OPSF
None of the above
IGMP
2. Which of following statements most accurately describes the reverse-path broadcasting?

It assumes that the shortest path from the source to a given router should be the same as the shortest path from the router to the source
Each link in the network to be symmetric
Each packet is forwarded by a router exactly once
All of the above
It assumes that the shortest path from the source to a given router should be the same as the shortest path from the router to the source
3. Which class of IP address does the reverse-path broadcasting uses?

Class B
Class D
Class C
Class A
Class D
4. Attackers attempt to gain unauthorized access to server. What type of network security threat it imposes?

Client imposter
Server imposter
Man-in-Middle
None of the above
Client imposter
5. In mobile IP, when a home agent wants to send a packet to a mobile host in a foreign network, each IP packet at the home agent will be encapsulated with an outer IP header. What is the destination IP address in the outer IP header?

Care-of address
Mobile host's address
Home agent's address
None of the above
Care of address
6. An IP address associated with a mobile node while visiting a foreign link

Handover address
Home address
Care of address
Home link
Care of address
7. TCP SYN flood attack exploits the TCP three-way handshake

True
False
True
8. In multicast communication, relationship is

one to one
many to one
one to many
one to all
One to many
1. What is the security requirement in case of Denial of Service?

Privacy
Availability
Integrity
None of the above
Availability
2. In a software defined network (SDN), which of the architectural layer is responsible for switch configuration and forwarding instruction?

Middle layer
Infrastructure layer
Security layer
None of the above
Middle layer
3. What is the security requirement in case of Malicious Code?

Privacy
Availability
Integrity
All of the above
All of the above
4. Which of the following is not a general misconception of SDN?

SDN is a mechanism
SDN is an open API for that provides standard interface for programming switches
SDN is a framework to solve a set of problems
All of the above
SDN is a framework to solve a set of problems
5. Which component of NFV comprises of hardware and software required to deploy, manage and execute VNFs

Network function
Network function modules
NFVI
None of the above
NFVI
6. In Reverse-Path Broadcasting (RPB) scenario, assume each router knows current shortest path to source node. Which of the following statement denotes the router's action

The router stores the packet in a buffer and wait for an explicit routing request from the source
If shortest path to source is through the same port, router forwards the packet to all other ports
If shortest path to source is through different port, router drops the packet
Upon receipt of a multicast packet, router records the packet's destination address and the forwarding port
If shortest path to source is through different port, router drops the packet;
If shortest path to source is through the same port, router forwards the packet to all other ports
7. A peer with which a mobile node is communicating is called

Correspondent node
Mobile node
Foreign agent
Home agent
Correspondent node
8. Reverse Path Multicasting (RPM) is used to increase

Efficiency
Performance
Accuracy
Strength
Efficiency
9. In Reverse Path Forwarding, router receives a packet and extracts the

Source address
Protocol address
IP address
Standard address
Source address
10. A network can receive a multicast packet from a particular source only through a

designated parent resolve
designated parent router
designated protocol router
None of the above
designated parent router
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