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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. Who can assign IP address space to end user organizations?
All Internet Registries
Urgent
0
Used by IRDP on some operating systems to discover local routers

2. What is the Fragment Offset field in the IPv4 header?
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);
4
255.255.255.248
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

3. What is prefix /29 in decimal notation?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
ECN-Echo
Largest segment size that the sender is willing to accept
255.255.255.248

4. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
An ARP request issued by a host with its own IPv4 address as the target address
Subtract Header Length field from Total Length field
DSCP (6-bit); ECN (2-bit)
Sequence Number + Data payload octets + 1

5. Who group public IPv4 address space by major geographic region?
ICANN and IANA
ECN-Echo
URG flag set
Echo

6. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
8
Echo Reply

7. What is the ARP Operation value for an Inverse ARP Request?
8
DHCP
89
9

8. What mechanisms are used by TCP to provide reliable segment delivery?
89
Router(config)#ip arp proxy disable
198.18.0.0/15
Acknowledgements - checksums and timers

9. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Router(config)#arp {ip-address} {mac-address} arpa
Largest segment size that the sender is willing to accept
Sequence Number
Internet Protocol

10. What is the format of an ICMP header?
1
Network interface
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Time Exceeded

11. What is LIR?
Router#show arp
Router(config-if)#no ip proxy-arp
Local Internet Registry
3

12. What are classless routing protocols?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Router(config-if)#no ip proxy-arp
Protocols that include subnet masks in their routing updates
Padding of zeros to ensure that the header ends on a 32-bit boundary

13. Disables proxy ARP on all interfaces
RIRs
Router(config)#ip arp proxy disable
Address Resolution Protocol
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

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

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15. What is the purpose of a socket?
9
Uniquely identify every application in the network
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Mostly large ISPs - enterprises - or academic institutions

16. What is FIN?
Internet
Echo
Final
IANA

17. What is the IPv4 Protocol number for OSPF?
255.255.255.248
Loose source routing; Strict source routing; Record route; Timestamp
Address Resolution Protocol
89

18. Specifies the format in which subnet masks are displayed in show command output
IANA
Network interface
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

19. What is ICMP Type 3?
IANA
Destination Unreachable
Address Resolution Protocol
Router(config-if)#no ip proxy-arp

20. What is Inverse ARP?

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21. What is URG?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
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
Urgent
Host-to-host

22. What is IRDP?
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
ICMP Router Discovery Protocol
3
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);

23. Disables proxy ARP on an interface
89
Router(config-if)#no ip proxy-arp
Internet
DHCP

24. Who allocates IP address space and AS numbers to RIRs?
IANA
Transmission Control Protocol
Both the TCP header and the encapsulated data
NIRs

25. What is the format of an IPv4 header?
ICMP Router Discovery Protocol
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);
20 octets

26. What is the IPv4 Protocol number for GRE?
Sequence Numbers
LIRs
47
Host-to-host

27. What are the protocol categories that describe the physical layer?
Destination Unreachable
Router(config)#arp {ip-address} {mac-address} arpa
Electrical/Optical - Mechanical - Functional and Procedural
Router Selection

28. What is the format of the TCP Header Length field?
Local Internet Registry
Destination Unreachable
More Fragments follow
Length of header in words (32-bit)

29. What is the format of the Flags field in the IPv4 header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Urgent
47
Sequence Number

30. What is the content of the the Urgent Pointer field in the TCP header?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Uniquely identify every application in the network
RFC 791
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

31. What is the IPv4 Protocol number for ICMP?
Address Resolution Protocol
3
1
4

32. What is CWR?
Open Systems Interconnection
Congestion Window Reduced
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

33. Displays the ARP cache of a router
127.0.0.0/8
Router#show arp
URG flag set
2

34. What is prefix /27 in decimal notation?
255.255.255.224
Internet Corporation for Assigned Network Numbers
17
RIPv1 and IGRP

35. Deletes dynamic entries from the ARP cache
DHCP
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Identifier; Flags and Fragmentation Offset
9

36. What is OSI?
Sequence Number
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Urgent
Open Systems Interconnection

37. Which IPv4 address range is reserved for loopback testing?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
ECN-Echo
127.0.0.0/8
Per-Hop Behaviour (PHB)

38. What is the name of the queuing and forwarding of IP packets based on DiffServ?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Transmission Control Protocol
Per-Hop Behaviour (PHB)
1

39. What is the format of the ToS byte in the IPv4 header?
Sequence Number + Data payload octets + 1
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
RIRs
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

40. What is the ARP Operation value for an ARP Reply?
IANA
2
Windowing
Data Offset

41. What is the maximum length of an IPv4 header?
Windowing
255.255.255.252
60 octets
NIRs

42. What is the prerequisite for using the Urgent Pointer field in the TCP header?
Time Exceeded
Protocols that don't include subnet masks in their routing updates
URG flag set
Used by a host to obtain the IPv4 address associated with its own MAC address

43. What is the most commonly used Option field in the TCP header?
Maximum Segment Size (MSS)
255.255.255.224
198.18.0.0/15
127.0.0.0/8

44. What is the format of a TCP header?
DSCP (6-bit); ECN (2-bit)
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
Urgent
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

45. What is the IPv4 Protocol number for EIGRP?
Sequence Numbers
88
Don't Fragment
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

46. What are the steps to subnet an IPv4 address?
Open Systems Interconnection
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
Padding of zeros to ensure that the header ends on a 32-bit boundary
RIPv1 and IGRP

47. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
192.88.99.0/24
1
IPv4 and IPv6
89

48. What is the minimum length of an IPv4 header?
20 octets
Time Exceeded
DSCP (6-bit); ECN (2-bit)
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

49. What is ICMP Type 11?
Identifier; Flags and Fragmentation Offset
DSCP (6-bit); ECN (2-bit)
Time Exceeded
Push

50. What is covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
9
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Uniquely identify every application in the network