Test your basic knowledge |

IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is the IPv4 Protocol number for TCP?
Router(config)#ip arp proxy disable
Sequence Numbers
6
Per-Hop Behaviour (PHB)

2. What is ARP?
Address Resolution Protocol
RIPv1 and IGRP
Largest segment size that the sender is willing to accept
ICANN and IANA

3. What is ICANN?
Host-to-host
Internet Corporation for Assigned Network Numbers
127.0.0.0/8
89

4. What is the format of the Flags field in the TCP header?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Router#debug arp
Router(config-if)#no ip proxy-arp
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

5. What are classful routing protocols?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

6. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Maximum Segment Size (MSS)
Used by a host to obtain the IPv4 address associated with its own MAC address
Internet
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

7. What is the ARP Protocol address length value for IPv4?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
4
Urgent
89

8. What is the content of the the Urgent Pointer field in the TCP header?
ICANN
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Electrical/Optical - Mechanical - Functional and Procedural

9. What is PSH?
Protocols that include subnet masks in their routing updates
47
ICANN and IANA
Push

10. What is the ARP Operation value for an Inverse ARP Reply?
Router Selection
3
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
9

11. What is Reverse ARP?
Router Selection
Used by a host to obtain the IPv4 address associated with its own MAC address
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Internet Protocol

12. What is the minimum length of an IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
20 octets
89
9

13. Enables debugging output for ARP transactions
Identifier; Flags and Fragmentation Offset
RFC 791
Router#debug arp
LIRs

14. Disables proxy ARP on an interface
Echo Reply
Time to Live
Router(config-if)#no ip proxy-arp
Local Internet Registry

15. What is proxy ARP?
Destination Unreachable
Used by a host to obtain the IPv4 address associated with its own MAC address
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Source Port (16-bit); Destination Port (16-bit); Sequence Number (32-bit); Acknowledgement Number (32-bit); Header Length (4-bit); Reserved (4-bit); Flags (8-bit); Windows Size (16-bit); Checksum (16-bit); Urgent Pointer (16-bit); Options; Padding

16. What is IRDP?
ICMP Router Discovery Protocol
ICANN
Application
255.255.255.192

17. What is the value of the TCP Reserved field?
0
1
Identifier; Flags and Fragmentation Offset
Used by a host to obtain the IPv4 address associated with its own MAC address

18. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
Sequence Number
198.18.0.0/15
IANA
Loose source routing; Strict source routing; Record route; Timestamp

19. What mechanisms are used by TCP to provide reliable segment delivery?
Acknowledgements - checksums and timers
255.255.255.192
Router(config)#arp {ip-address} {mac-address} arpa
Router#clear arp-cache [{interface {interface}} | {ip-address}]

20. What is URG?
IANA
255.255.255.128
Urgent
Maximum Segment Size (MSS)

21. Disables proxy ARP on all interfaces
Protocols that don't include subnet masks in their routing updates
Router(config)#ip arp proxy disable
Per-Hop Behaviour (PHB)
RIPv1 and IGRP

22. What is ICMP Type 5?
Application
Redirect
Reset
0.0.0.0/8

23. Who administers and registers public IP address space and AS numbers within a country or economic unit?
NIRs
Loose source routing; Strict source routing; Record route; Timestamp
Synchronize
Time Exceeded

24. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Socket
Sequence Numbers
Host-to-host

25. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
169.254.0.0/16
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Time Exceeded
Internet Assigned Numbers Authority

26. What are the most frequently used options in the IPv4 header?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Length of header in words (32-bit)
Loose source routing; Strict source routing; Record route; Timestamp
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

27. What is the ARP Operation value for an ARP Request?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Network interface
1
Router Selection

28. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
ICMP Router Discovery Protocol
More Fragments follow
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
IANA

29. What are the IP Precedence values?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Each router decrements the TTL

30. What is added after the option field in the IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Sequence Number + Data payload octets + 1
1
Router(config-if)#no ip redirects

31. Why must the header checksum of an IPv4 packet be recalculated at every router?
URG flag set
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Sequence Number
Each router decrements the TTL

32. What is the purpose of a socket?
Socket
Uniquely identify every application in the network
Internet Corporation for Assigned Network Numbers
Echo Reply

33. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Sequence Number + Data payload octets + 1
Maximum Segment Size (MSS)
RIPv1 and IGRP
They are the same byte - but the names and value interpretations are different

34. What is the prerequisite for using the Urgent Pointer field in the TCP header?
The next sequence number that the source expects to receive from the destination
URG flag set
47
NIRs

35. Who can assign IP address space to end user organizations?
All Internet Registries
127.0.0.0/8
255.255.255.192
IPv4 and IPv6

36. What is the IPv4 Protocol number for OSPF?
Router(config-if)#no ip proxy-arp
89
RFC 3330
255.255.255.240

37. What is the IPv4 Protocol number of RSVP?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
46
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

38. What is ICMP Type 10?
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address
6
0.0.0.0/8
Router Selection

39. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Per-Hop Behaviour (PHB)
NIRs
They are the same byte - but the names and value interpretations are different
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

40. Who administers and registers IP address space and AS numbers within a region?
Router(config-if)#no ip redirects
RIRs
46
60 octets

41. What is RIR?
Socket
255.255.255.224
Regional Internet Registry
RFC 1918

42. What is Inverse ARP?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

43. Who allocates IP address space and AS numbers to RIRs?
More Fragments follow
IANA
Version (4-bit); Header Length (4-bit); ToS (8-bit); Total Length (16-bit); Identifier (16-bit); Flags (3-bit); Fragment Offset (13-bit); TTL (8-bit); Protocol (8-bit); Header Checksum (16-bit); Source Address (32-bit); Destination Address (32-bit);
255.255.255.192

44. Which protocol has mostly replaced Reverse ARP?
DHCP
Synchronize
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
6

45. Displays the ARP cache of a router
IANA
Router#show arp
Address Resolution Protocol
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

46. What is the ARP Operation value for a Reverse ARP Request?
An ARP request issued by a host with its own IPv4 address as the target address
3
88
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address

47. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary
0x0800

48. What is a TCP Acknowledgement Number?
Address Resolution Protocol
Router#show arp
The next sequence number that the source expects to receive from the destination
Local Internet Registry

49. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
20 octets
Internet
Router#clear arp-cache [{interface {interface}} | {ip-address}]

50. What is covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
Open Systems Interconnection
All Internet Registries
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields