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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 the function of ICMP redirect messages?
DHCP
8
Router#show arp
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

2. What is ICMP Type 0?
Socket
47
Sequence Number + Data payload octets + 1
Echo Reply

3. What is the ARP Hardware address length value for Ethernet?
Router(config-if)#no ip proxy-arp
192.0.2.0/24
Number of octets - starting with the octet indicated by the Acknowledgement Number - that the receiver will accept from the sender before the sender must stop transmitting and wait for a new Acknowledgement
6

4. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Host-to-host
Acknowledgement
DSCP (6-bit); ECN (2-bit)

5. Who assigns IP address space to its own customers?
Destination Unreachable
198.18.0.0/15
LIRs
Length of header in words (32-bit)

6. What is prefix /26 in decimal notation?
Urgent
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
ICMP Router Discovery Protocol
255.255.255.192

7. What is the format of a TCP header?
Router(config)#ip arp proxy disable
192.88.99.0/24
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
They are the same byte - but the names and value interpretations are different

8. What is the content of the the Urgent Pointer field in the TCP header?
3
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
89
All Internet Registries

9. What is covered by the TCP Checksum field?
Uniquely identify every application in the network
Both the TCP header and the encapsulated data
255.255.255.240
Transmission Control Protocol

10. What is LIR?
DHCP
Local Internet Registry
255.255.255.240
3

11. What is ECE?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Redirect
127.0.0.0/8
ECN-Echo

12. 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
Router(config-if)#no ip redirects
Router#show arp
ICANN

13. What is IRDP?
Host-to-host
ICMP Router Discovery Protocol
Synchronize
Padding of zeros to ensure that the header ends on a 32-bit boundary

14. Displays the ARP cache of a router
Router#show arp
Internet
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

15. What is the the MF-bit in the IPv4 header?
More Fragments follow
1
Time Exceeded
192.0.2.0/24

16. What is the ARP Operation value for an Inverse ARP Reply?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
9
2
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

17. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
Router#debug arp
Internet
Reserved (1-bit); DF (1-bit); MF (1-bit)

18. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
Acknowledgements - checksums and timers
Both the TCP header and the encapsulated data
Open Systems Interconnection

19. What is ACK?
Data Offset
Local Internet Registry
Acknowledgement
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

20. What is IANA?
Internet Assigned Numbers Authority
The next sequence number that the source expects to receive from the destination
Internet
RIRs

21. What is FIN?
255.255.255.224
Final
Protocols that include subnet masks in their routing updates
Router Advertisement

22. What is added after the option field in the IPv4 header?
Time to Live
Padding of zeros to ensure that the header ends on a 32-bit boundary
RIRs
255.255.255.192

23. What is the format of the Flags field in the TCP header?
255.255.255.224
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
127.0.0.0/8
Congestion Window Reduced

24. What is the format of the DiffServ byte?
Mostly large ISPs - enterprises - or academic institutions
60 octets
Protocols that include subnet masks in their routing updates
DSCP (6-bit); ECN (2-bit)

25. What is the ARP Protocol type value for IPv4?
RIRs
RFC 1918
IANA
0x0800

26. What is the IPv4 Protocol number for TCP?
ICANN
88
6
Each router decrements the TTL

27. What is PSH?
IANA
9
Push
2

28. What is the ARP Operation value for an Inverse ARP Request?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
8
4
RFC 791

29. What is ICMP Type 3?
RIRs
Destination Unreachable
2
Application

30. Disables proxy ARP on an interface
Reserved (1-bit); DF (1-bit); MF (1-bit)
IPv4 and IPv6
Router(config-if)#no ip proxy-arp
Sequence Numbers

31. What is the IPv4 Protocol number for ICMP?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
1
RFC 1918
Router(config-if)#no ip redirects

32. What are the private IPv4 address ranges?
LIRs
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
4
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

33. What is the ARP Operation value for a Reverse ARP Reply?
Uniquely identify every application in the network
Socket
4
1

34. What is added after the Option field in the TCP header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
IANA
DSCP (6-bit); ECN (2-bit)

35. What is ICMP?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
An ARP request issued by a host with its own IPv4 address as the target address
Internet Control Message Protocol
Acknowledgement

36. What is SYN?
Synchronize
Reserved (1-bit); DF (1-bit); MF (1-bit)
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
2

37. What is Inverse ARP?

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38. What is the first octet rule for IPv4 address classes in binary?
255.255.255.240
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Regional Internet Registry
Sequence Number + Data payload octets + 1

39. What is the format of the Flags field in the IPv4 header?
NIRs
8
Reserved (1-bit); DF (1-bit); MF (1-bit)
DSCP (6-bit); ECN (2-bit)

40. Adds a permanent static ARP entry for an Ethernet host
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Router(config-if)#no ip redirects
ICANN
Router(config)#arp {ip-address} {mac-address} arpa

41. What is the IPv4 Protocol number for OSPF?
4
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
64
89

42. What is the ARP Operation value for a Reverse ARP Request?
3
4
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Identifier; Flags and Fragmentation Offset

43. What mechanism is used by TCP to provided ordered segment delivery?
Sequence Numbers
0x0800
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Largest segment size that the sender is willing to accept

44. What are the uses of gratuitous ARP?
Used by IRDP on some operating systems to discover local routers
RFC 791
Internet Corporation for Assigned Network Numbers
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

45. What is CWR?
Padding of zeros to ensure that the header ends on a 32-bit boundary
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
All Internet Registries
Congestion Window Reduced

46. What are the steps to subnet an IPv4 address?
Number of octets - starting with the octet indicated by the Acknowledgement Number - that the receiver will accept from the sender before the sender must stop transmitting and wait for a new Acknowledgement
RIRs
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
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

47. Which protocol has mostly replaced Reverse ARP?
DHCP
Don't Fragment
2
89

48. What is the purpose of a socket?
Reset
Internet
Uniquely identify every application in the network
Data Offset

49. What is gratuitous ARP?
Sequence Numbers
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
An ARP request issued by a host with its own IPv4 address as the target address
Each router decrements the TTL

50. What is the most commonly used Option field in the TCP header?
Address Resolution Protocol
Router(config-if)#no ip proxy-arp
Maximum Segment Size (MSS)
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application