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 FIN?
6
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
RFC 1918
Final

2. What are the steps to subnet an IPv4 address?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router#debug arp
2
1 Determine how many subnets are required; 2 Determine how many hosts per subnet are required; 3 Determine the subnet mask for each subnet; 4 Calculate the network address for each subnet

3. What is the format of an ICMP header?
64
Internet
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
ICANN and IANA

4. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
6
Acknowledgement
All Internet Registries
192.88.99.0/24

5. What is the format of a UDP header?
ICANN
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Destination Unreachable

6. What IPv4 header fields are used for fragmentation?
0x0800
IANA
Identifier; Flags and Fragmentation Offset
RIRs

7. Disables the sending of ICMP redirect messages
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
The next sequence number that the source expects to receive from the destination
Router(config-if)#no ip redirects

8. What is the other name for the TCP Header Length field?
Uniquely identify every application in the network
IANA
Data Offset
Padding of zeros to ensure that the header ends on a 32-bit boundary

9. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
255.255.255.128
1
3
Application

10. What is RIR?
Per-Hop Behaviour (PHB)
Regional Internet Registry
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
4

11. What is ECE?
ECN-Echo
4
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
National Internet Registry

12. Specifies the format in which subnet masks are displayed in show command output
Sequence Numbers
255.255.255.224
Protocols that don't include subnet masks in their routing updates
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

13. Which RFC defines the private IPv4 address ranges?
RFC 1918
Padding of zeros to ensure that the header ends on a 32-bit boundary
198.18.0.0/15
RIPv1 and IGRP

14. What is CWR?
1
Congestion Window Reduced
4
Router Selection

15. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Open Systems Interconnection
2
ICANN
192.0.2.0/24

16. Disables proxy ARP on an interface
Router(config-if)#no ip proxy-arp
IANA
Push
6

17. Who are LIRs?
255.255.255.192
4
Mostly large ISPs - enterprises - or academic institutions
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

18. What is the ARP Hardware address length value for Ethernet?
Length of header in words (32-bit)
DHCP
Final
6

19. What is ISP?
Internet Service Provider
Time to Live
RIRs
Congestion Window Reduced

20. What is the format of an ARP packet?
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
Router Selection
Application
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

21. Why must the header checksum of an IPv4 packet be recalculated at every router?
Each router decrements the TTL
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
255.255.255.192
More Fragments follow

22. What is ICMP Type 8?
1
Echo
Router(config-if)#no ip proxy-arp
89

23. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
20 octets
Loose source routing; Strict source routing; Record route; Timestamp
89
198.18.0.0/15

24. What is the ARP Operation value for a Reverse ARP Reply?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Maximum Segment Size (MSS)
Internet Service Provider
4

25. What is URG?
20 octets
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary
Urgent

26. What is ICMP?
Router(config-if)#arp timeout {seconds}
Each router decrements the TTL
Redirect
Internet Control Message Protocol

27. What is the TTL field in the IPv4 header?
Application
Internet Protocol
4
Time to Live

28. Who group public IPv4 address space by major geographic region?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
ICMP Router Discovery Protocol
IPv4 and IPv6
ICANN and IANA

29. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Used by a host to obtain the IPv4 address associated with its own MAC address
Transmission Control Protocol
88
Sequence Number + Data payload octets + 1

30. What are classful routing protocols?

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

31. What is the IPv4 Protocol number for EIGRP?
More Fragments follow
Identifier; Flags and Fragmentation Offset
88
RIRs

32. Who can assign IP address space to end user organizations?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Network interface
Socket
All Internet Registries

33. What is IANA?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Internet Assigned Numbers Authority
Don't Fragment
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);

34. What is the minimum length of an IPv4 header?
192.0.2.0/24
Router(config-if)#arp timeout {seconds}
Both the TCP header and the encapsulated data
20 octets

35. What is ARP?
Address Resolution Protocol
Regional Internet Registry
Used by a host to obtain the IPv4 address associated with its own MAC address
Don't Fragment

36. What is Inverse ARP?

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

37. What is the format of the DiffServ byte?
169.254.0.0/16
DSCP (6-bit); ECN (2-bit)
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);
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

38. What is the ARP Operation value for an ARP Reply?
6
URG flag set
2
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

39. What is proxy ARP?
Router#debug arp
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Address Resolution Protocol

40. What is the first octet rule for IPv4 address classes in decimal?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
192.0.2.0/24
3

41. What is prefix /26 in decimal notation?
255.255.255.192
DSCP (6-bit); ECN (2-bit)
Electrical/Optical - Mechanical - Functional and Procedural
Router#clear arp-cache [{interface {interface}} | {ip-address}]

42. Who assigns IP address space to its own customers?
LIRs
Network interface
Internet Service Provider
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

43. What is the ARP Operation value for an ARP Request?
Router(config-if)#arp timeout {seconds}
Application
Regional Internet Registry
1

44. What is the format of the ToS field?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Echo Reply
Length of header in words (32-bit)
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

45. What is the IPv4 Protocol number of RSVP?
46
RIRs
Router Selection
17

46. What is the Fragment Offset field in the IPv4 header?
192.0.2.0/24
2
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Internet Control Message Protocol

47. What mechanism is used by TCP to regulate the flow of segments?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Sequence Numbers
Windowing
Mostly large ISPs - enterprises - or academic institutions

48. What is the DF-bit in the IPv4 header?

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

49. Who administers and registers IP address space and AS numbers within a region?
88
47
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
RIRs

50. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet Protocol
Internet
ICANN and IANA
4