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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. What is ICMP Type 11?
Subtract Header Length field from Total Length field
46
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Time Exceeded

2. What is the IPv4 Protocol number for IGMP?
2
Echo
Urgent
RFC 791

3. What is the difference between the ToS and the DiffServ byte?
Echo Reply
They are the same byte - but the names and value interpretations are different
Protocols that include subnet masks in their routing updates
ICANN and IANA

4. What are the steps to subnet an IPv4 address?
Reserved (1-bit); DF (1-bit); MF (1-bit)
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
Redirect
1

5. What are the IP Precedence values?
Host-to-host
DHCP
Echo
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

6. What is ARP?
Data Offset
Router(config-if)#no ip proxy-arp
Local Internet Registry
Address Resolution Protocol

7. What is Reverse 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
Destination Unreachable
Used by a host to obtain the IPv4 address associated with its own MAC address
Router(config)#ip arp proxy disable

8. What is prefix /26 in decimal notation?
Router(config)#arp {ip-address} {mac-address} arpa
0
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
255.255.255.192

9. Disables the sending of ICMP redirect messages
255.255.255.240
Router(config-if)#no ip redirects
Final
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);

10. What mechanism is used by TCP to provided ordered segment delivery?
ICMP Router Discovery Protocol
Destination Unreachable
Sequence Numbers
89

11. What is the IPv4 Protocol number for ICMP?
Congestion Window Reduced
9
ECN-Echo
1

12. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Largest segment size that the sender is willing to accept
Internet Control Message Protocol
ICMP Router Discovery Protocol
Router(config-if)#no ip redirects

13. What is the function of ICMP redirect messages?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Router(config)#ip arp proxy disable
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Destination Unreachable

14. What is ICMP Type 10?
Router Selection
Router(config-if)#arp timeout {seconds}
1
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

15. What is ICMP Type 8?
2
The next sequence number that the source expects to receive from the destination
Echo
Internet Corporation for Assigned Network Numbers

16. Which protocol has mostly replaced Reverse ARP?
IANA
Transmission Control Protocol
17
DHCP

17. What is proxy ARP?
0x0800
The next sequence number that the source expects to receive from the destination
RIRs
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

18. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
8
Sequence Number + Data payload octets + 1
IANA

19. What is IRDP?
6
ICMP Router Discovery Protocol
Internet
89

20. What is the format of the Flags field in the TCP header?
Per-Hop Behaviour (PHB)
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
89
Router(config)#ip arp proxy disable

21. Specifies the format in which subnet masks are displayed in show command output
Router Selection
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Sequence Numbers

22. What is the format of an 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);
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Padding of zeros to ensure that the header ends on a 32-bit boundary
Reserved (1-bit); DF (1-bit); MF (1-bit)

23. What is the recommended default TTL?
0x0800
Address Resolution Protocol
64
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

24. What is the format of the ToS byte in the IPv4 header?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Router#show arp
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

25. What is the ARP Operation value for an Inverse ARP Reply?
Sequence Number
9
Router(config)#arp {ip-address} {mac-address} arpa
0.0.0.0/8

26. What IPv4 header fields are used for fragmentation?
LIRs
An ARP request issued by a host with its own IPv4 address as the target address
Local Internet Registry
Identifier; Flags and Fragmentation Offset

27. Displays the ARP cache of a router
Address Resolution Protocol
Push
Router(config)#ip arp proxy disable
Router#show arp

28. What is the maximum length of an IPv4 header?
60 octets
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
Router(config)#ip arp proxy disable
IANA

29. What mechanisms are used by TCP to provide reliable segment delivery?
Internet Corporation for Assigned Network Numbers
RIRs
Used by IRDP on some operating systems to discover local routers
Acknowledgements - checksums and timers

30. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Router#debug arp
4
IANA
Network interface

31. What is SYN?
Sequence Number
Internet Control Message Protocol
Padding of zeros to ensure that the header ends on a 32-bit boundary
Synchronize

32. What is the ARP Operation value for an Inverse ARP Request?
Echo Reply
ICANN and IANA
192.88.99.0/24
8

33. What is RIR?
Maximum Segment Size (MSS)
Regional Internet Registry
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
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

34. What is the ARP Protocol type value for IPv4?
0x0800
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
URG flag set
ECN-Echo

35. What is the IPv4 Protocol number for GRE?
2
Both the TCP header and the encapsulated data
47
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

36. Deletes dynamic entries from the ARP cache
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);
Router#clear arp-cache [{interface {interface}} | {ip-address}]
ECN-Echo
Sequence Number + Data payload octets + 1

37. Who can assign IP address space to end user organizations?
ECN-Echo
255.255.255.192
IANA
All Internet Registries

38. What is the format of the Flags field in the IPv4 header?
Sequence Number
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Reserved (1-bit); DF (1-bit); MF (1-bit)
RIRs

39. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
IANA
Acknowledgement
Don't Fragment
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

40. What is ICMP Type 0?
Echo Reply
Each router decrements the TTL
An ARP request issued by a host with its own IPv4 address as the target address
Length of header in words (32-bit)

41. What are the protocol categories that describe the physical layer?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Electrical/Optical - Mechanical - Functional and Procedural
ICANN
An ARP request issued by a host with its own IPv4 address as the target address

42. What is the ARP Operation value for a Reverse ARP Request?
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
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
Each router decrements the TTL
3

43. What is a TCP Acknowledgement Number?
The next sequence number that the source expects to receive from the destination
Router(config-if)#no ip proxy-arp
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

44. What is URG?
ECN-Echo
0
Urgent
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

45. What is ICMP Type 5?
Redirect
Uniquely identify every application in the network
6
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

46. What is ACK?
Router(config-if)#no ip redirects
Acknowledgement
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

47. What is Inverse ARP?

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48. What is prefix /29 in decimal notation?
IANA
255.255.255.248
Urgent
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);

49. What is the format of a TCP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-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
Used by IRDP on some operating systems to discover local routers
0x0800

50. What is the first octet rule for IPv4 address classes in decimal?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Echo
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254