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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?
Time Exceeded
ICANN
Final
4

2. What mechanism is used by TCP to regulate the flow of segments?
Router(config-if)#no ip proxy-arp
Windowing
Loose source routing; Strict source routing; Record route; Timestamp
RIPv1 and IGRP

3. What is PSH?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
4
Push
1

4. What is ECE?
RIRs
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
ECN-Echo
RFC 1918

5. What is the ARP Protocol type value for IPv4?
Internet Assigned Numbers Authority
Protocols that don't include subnet masks in their routing updates
Echo
0x0800

6. What is the ARP Operation value for a Reverse ARP Reply?
4
Sequence Numbers
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
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

7. Which RFC defines IPv4?
255.255.255.252
Padding of zeros to ensure that the header ends on a 32-bit boundary
RFC 791
RIRs

8. Who assigns IP address space to its own customers?
They are the same byte - but the names and value interpretations are different
DHCP
Router(config)#arp {ip-address} {mac-address} arpa
LIRs

9. What is the purpose of a socket?
Each router decrements the TTL
Transmission Control Protocol
Internet Assigned Numbers Authority
Uniquely identify every application in the network

10. What is the IPv4 Protocol number for EIGRP?
URG flag set
255.255.255.192
88
Time Exceeded

11. Disables proxy ARP on all interfaces
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Router(config)#ip arp proxy disable
Socket
LIRs

12. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
169.254.0.0/16
Maximum Segment Size (MSS)
Router#debug arp
Used by a host to obtain the IP address associated with another host's MAC address

13. What is OSI?
192.88.99.0/24
Redirect
Open Systems Interconnection
0

14. What is the Fragment Offset field in the IPv4 header?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Router(config)#ip arp proxy disable
Network interface
60 octets

15. Which RFC defines the private IPv4 address ranges?
RFC 1918
1
Transmission Control Protocol
169.254.0.0/16

16. What is prefix /28 in decimal notation?
Per-Hop Behaviour (PHB)
Router(config)#arp {ip-address} {mac-address} arpa
4
255.255.255.240

17. What is NIR?
They are the same byte - but the names and value interpretations are different
Router(config-if)#no ip redirects
National Internet Registry
169.254.0.0/16

18. What is ICMP Type 8?
192.88.99.0/24
Time Exceeded
Router(config-if)#no ip proxy-arp
Echo

19. What is the content of the the Urgent Pointer field in the TCP header?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
47
Sequence Number + Data payload octets + 1
0x0800

20. What is the value of the TCP Reserved field?
Host-to-host
Padding of zeros to ensure that the header ends on a 32-bit boundary
0
Padding of zeros to ensure that the header ends on a 32-bit boundary

21. What is the format of a TCP header?
8
255.255.255.240
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
Time Exceeded

22. What is the ARP Operation value for an Inverse ARP Reply?
Internet Service Provider
Reset
9
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

23. What is IRDP?
ECN-Echo
Sequence Number
ICMP Router Discovery Protocol
47

24. What is URG?
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(config-if)#no ip redirects
Reserved (1-bit); DF (1-bit); MF (1-bit)
Urgent

25. What is a TCP port number of an application called when it is coupled with the IP address of the server?
89
Destination Unreachable
1
Socket

26. What is a TCP Acknowledgement Number?
4
The next sequence number that the source expects to receive from the destination
Electrical/Optical - Mechanical - Functional and Procedural
URG flag set

27. What IPv4 header fields are used for fragmentation?
Identifier; Flags and Fragmentation Offset
Internet Service Provider
LIRs
169.254.0.0/16

28. What is the content of the TCP Window Size field?
Router#show arp
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
Internet Service Provider
Time Exceeded

29. What is prefix /27 in decimal notation?
255.255.255.224
RIRs
4
IPv4 and IPv6

30. What is the the MF-bit in the IPv4 header?
More Fragments follow
National Internet Registry
Padding of zeros to ensure that the header ends on a 32-bit boundary
0.0.0.0/8

31. What is IP?
255.255.255.128
255.255.255.192
Data Offset
Internet Protocol

32. What is the first octet rule for IPv4 address classes in binary?
0
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Socket
20 octets

33. Specifies the format in which subnet masks are displayed in show command output
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Router#show arp
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Router Selection

34. What is prefix /30 in decimal notation?
255.255.255.252
Both the TCP header and the encapsulated data
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
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

35. What is the format of a UDP header?
20 octets
Loose source routing; Strict source routing; Record route; Timestamp
Echo
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

36. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Urgent
Largest segment size that the sender is willing to accept
Internet Assigned Numbers Authority
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

37. What is covered by the TCP Checksum field?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
9
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Both the TCP header and the encapsulated data

38. Which RFC defines the special use IPv4 address ranges?
Regional Internet Registry
RFC 3330
IANA
46

39. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
ICMP Router Discovery Protocol
192.88.99.0/24
Sequence Number + Data payload octets + 1

40. Which IPv4 address range is reserved for loopback testing?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
127.0.0.0/8
Acknowledgements - checksums and timers
Open Systems Interconnection

41. What is the IPv4 Protocol number for ICMP?
46
1
0x0800
Router(config)#arp {ip-address} {mac-address} arpa

42. What mechanism is used by TCP to provided ordered segment delivery?
Time to Live
Router(config-if)#no ip proxy-arp
RFC 1918
Sequence Numbers

43. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
0x0800
1
4

44. Who administers and registers IP address space and AS numbers within a region?
6
Sequence Number
88
RIRs

45. What is Reverse ARP?
NIRs
Loose source routing; Strict source routing; Record route; Timestamp
Used by a host to obtain the IPv4 address associated with its own MAC address
Address Resolution Protocol

46. What are the IP Precedence values?
6
Urgent
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Internet Protocol

47. What are classless routing protocols?
127.0.0.0/8
Protocols that include subnet masks in their routing updates
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Congestion Window Reduced

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

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49. What is prefix /25 in decimal notation?
3
255.255.255.128
Internet Protocol
Protocols that include subnet masks in their routing updates

50. Displays the ARP cache of a router
Router#show arp
Reset
Open Systems Interconnection
Internet Assigned Numbers Authority