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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 ARP Hardware type value for Ethernet?
1
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Open Systems Interconnection
Length of header in words (32-bit)

2. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
1
Data Offset
Router(config-if)#no ip proxy-arp
IANA

3. What is the ARP Protocol address length value for IPv4?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
4
1

4. What is ICMP Type 3?
169.254.0.0/16
DHCP
6
Destination Unreachable

5. What is covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
Internet Service Provider
IANA
Padding of zeros to ensure that the header ends on a 32-bit boundary

6. Displays the ARP cache of a router
Router(config)#ip arp proxy disable
Windowing
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router#show arp

7. Deletes dynamic entries from the ARP cache
Protocols that include subnet masks in their routing updates
Internet Control Message Protocol
Router#clear arp-cache [{interface {interface}} | {ip-address}]
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

8. What is NIR?
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
2
National Internet Registry
4

9. What is the IPv4 Protocol number for EIGRP?
88
Reset
RIRs
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

10. What is the the MF-bit in the IPv4 header?
National Internet Registry
Router#debug arp
Windowing
More Fragments follow

11. What is prefix /25 in decimal notation?
255.255.255.128
0
255.255.255.240
More Fragments follow

12. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
Sequence Number
198.18.0.0/15
46
Time to Live

13. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
IANA
RFC 791
Router(config)#arp {ip-address} {mac-address} arpa
Reserved (1-bit); DF (1-bit); MF (1-bit)

14. What routing protocols are classful?
255.255.255.252
RFC 1918
RIPv1 and IGRP
DHCP

15. What is ICMP Type 10?
RFC 1918
Router(config-if)#no ip redirects
Router Selection
National Internet Registry

16. What is the content of the TCP Window Size field?
The next sequence number that the source expects to receive from the destination
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
Subtract Header Length field from Total Length field
IPv4 and IPv6

17. What is ICMP Type 5?
Redirect
Router(config)#arp {ip-address} {mac-address} arpa
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Address Resolution Protocol

18. What is the IPv4 Protocol number for IGMP?
Sequence Number + Data payload octets + 1
Network interface
NIRs
2

19. What is the IPv4 Protocol number of RSVP?
ICANN
46
RIRs
169.254.0.0/16

20. 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);
IANA
Internet Control Message Protocol
Protocols that don't include subnet masks in their routing updates

21. What is URG?
Mostly large ISPs - enterprises - or academic institutions
Urgent
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
198.18.0.0/15

22. 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
255.255.255.192
1
The next sequence number that the source expects to receive from the destination

23. What is RIR?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
64
Regional Internet Registry
1

24. What is the ARP Operation value for an ARP Request?
Subtract Header Length field from Total Length field
1
4
Acknowledgements - checksums and timers

25. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
17
46
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
National Internet Registry

26. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
192.88.99.0/24
2
Router(config-if)#no ip redirects
4

27. What is prefix /30 in decimal notation?
255.255.255.252
Echo Reply
DSCP (6-bit); ECN (2-bit)
Data Offset

28. What is added after the option field in the IPv4 header?
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
Address Resolution Protocol
Padding of zeros to ensure that the header ends on a 32-bit boundary
The next sequence number that the source expects to receive from the destination

29. Who administers and registers IP address space and AS numbers within a region?
255.255.255.224
RIRs
Windowing
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

30. What is prefix /29 in decimal notation?
Acknowledgement
Internet Assigned Numbers Authority
0x0800
255.255.255.248

31. Which RFC defines the private IPv4 address ranges?
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
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
RFC 1918
Router#clear arp-cache [{interface {interface}} | {ip-address}]

32. What is PSH?
Echo
RIRs
Uniquely identify every application in the network
Push

33. What is ICMP?
IANA
Internet Control Message Protocol
ICANN
Redirect

34. What is the value of the TCP Reserved field?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
0
Redirect
6

35. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
Router#show arp
Padding of zeros to ensure that the header ends on a 32-bit boundary
Loose source routing; Strict source routing; Record route; Timestamp

36. What mechanism is used by TCP to regulate the flow of segments?
0x0800
Windowing
Identifier; Flags and Fragmentation Offset
LIRs

37. What is the ARP Operation value for an Inverse ARP Reply?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Acknowledgement
9

38. What are classless routing protocols?
60 octets
Protocols that include subnet masks in their routing updates
RIRs
Largest segment size that the sender is willing to accept

39. What is the format of the DiffServ byte?
All Internet Registries
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
255.255.255.128
DSCP (6-bit); ECN (2-bit)

40. Which IPv4 address range is reserved for self-identification on a local subnet?
More Fragments follow
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
0.0.0.0/8
An ARP request issued by a host with its own IPv4 address as the target address

41. What is ICMP Type 11?
ICANN
Time Exceeded
Protocols that include subnet masks in their routing updates
255.255.255.240

42. Disables the sending of ICMP redirect messages
URG flag set
Each router decrements the TTL
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-if)#no ip redirects

43. Disables proxy ARP on all interfaces
Address Resolution Protocol
IPv4 and IPv6
Router(config)#ip arp proxy disable
Don't Fragment

44. What is the IPv4 Protocol number for GRE?
Urgent
47
Time Exceeded
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

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

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46. What is the most commonly used Option field in the TCP header?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Maximum Segment Size (MSS)
Urgent
Router#debug arp

47. What is the recommended default TTL?
DSCP (6-bit); ECN (2-bit)
Mostly large ISPs - enterprises - or academic institutions
64
RIRs

48. What are classful routing protocols?

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49. What is the format of an ARP packet?
Used by IRDP on some operating systems to discover local routers
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
255.255.255.192
Acknowledgements - checksums and timers

50. What is CWR?
2
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Congestion Window Reduced
Host-to-host