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Cisco Network Fundamentals - 2

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. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
User Datagram Protocol
Routing table
Upper
To track the different conversations crossing the network at the same time

2. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Web browsing - email - file transfer
Does not
1
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

3. Port 194 is?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
IRC
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Web browsing - email - file transfer

4. Port 443 is?
HTTPS (Secure HTTP)
Transport
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th

5. Port 110 is?
Decapsulation
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
POP3
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th

6. Which of the following are not functions of the network layer?
It means ensuring that each segment that the source sends arrives at the destination
TCP uses flow control
UDP
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer

7. What is the purpose of sequence numbers?
Routers (the subnetting process)
Allows the transport layer function on the destination host to reassemble segments in the right order
Purpose - ownership - and geographic location are key ways to divide a network
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

8. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
It Doesn't - TCP does
Telnet
It works the same on all Layer 1 media

9. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
TCP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Window size
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction

10. Port 520 is?
An alternate HTTP port
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
RIP (Routing Information Protocol)
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

11. The router a network uses to send and receive messages beyond the network is called a ___________ router.
TFTP - Trivial File Transfer Protocol
Gateway
It is the most common - and it encapsulates transport layer segments
Ephermeral

12. The three-way handshake performs what three functions?
Routers (the subnetting process)
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port

13. How many bits are in an IPv6 address?
Unique
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
128
Gateway

14. ACK is?
Window size
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
It means ensuring that each segment that the source sends arrives at the destination
Acknowledgment field significant

15. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Reliable - connection-oriented protocol (resends if not received)
Destination network - next-hop - metric
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da

16. For a network layer packet to travel between hosts - it must be handed down to the _________________ layer - for another layer of encapsulation called framing - and then encoded and put onto the ____________ layer to be sent to the next router.
FTP
UDP - it sends datagrams as 'best effort'
Data link - physical
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

17. Ports can be shared at the same time? (t/f)

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18. Are well known ports registered
It means ensuring that each segment that the source sends arrives at the destination
128
Telnet
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

19. Which is a connectionless protocol - UDP or TCP?
Synchronize sequence numbers
UDP
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
Purpose - ownership - and geographic location are key ways to divide a network

20. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
Allows the transport layer function on the destination host to reassemble segments in the right order
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
Maximum transmission unit

21. UDP does or does not create a session?
Static routing
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Does not
Reliable - connection-oriented protocol (resends if not received)

22. Dynamic ports fall into what category of port
Ephermeral
UDP
Unique
Upper

23. Port 20 is?
TCP
FTP
UDP
Not - these are done by other protocols in other layers

24. What are the transport layer's responsibilities?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
All
128

25. Encapsulation occurs at all - some or none of the layers of the OSI model?
TCP
Routers (the subnetting process)
All
128

26. What is the proper order of SYN sequence?
TFTP - Trivial File Transfer Protocol
Decapsulation
Connectionless
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

27. Routers add routes for the connected networks to their ________________ .
Allows the transport layer function on the destination host to reassemble segments in the right order
Web browsing - email - file transfer
To track the different conversations crossing the network at the same time
Routing table

28. End systems use port numbers to select the proper application. What is the lowest port number that can be dynamically assigned by the host system? 1 - 128 - 256 or 1024?
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
Purpose - ownership - and geographic location are key ways to divide a network
TCP
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

29. Which of the following are true about TCP and IP?

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30. MTU stands for ?
Maximum transmission unit
The default gateway address is the address of a router interface that is connected to the same network as the host.
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
FIN

31. What two commands can be used to view a host's routing table?
Routing table
Telnet
Netstat -r and route print
UDP

32. Pieces of information about a route that a routing table contains
DNS - video-streaming - VoIP
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

33. Which of the following is true about IP?

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34. Which protocol ensures more reliable delivery between applications - TCP or UDP?
TCP. It makes larger demands on a network
Routing table
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

35. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
RIP (Routing Information Protocol)
53
TCP uses flow control
The source and destination port number

36. What is the protocol number for UDP?
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
It Doesn't - TCP does
1
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

37. MSN messenger uses TCP or UDP?
TCP
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
RIP (Routing Information Protocol)
Gateway

38. Why is IP 'media independent'?
It is the most common - and it encapsulates transport layer segments
1
It means ensuring that each segment that the source sends arrives at the destination
It works the same on all Layer 1 media

39. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
Upper
The source and destination port number
To track the different conversations crossing the network at the same time

40. In networking terms - What is reliability?
It means ensuring that each segment that the source sends arrives at the destination
Data link - physical
Gateway
32 - there are four octets of 8 bits each in an IPv4 address

41. Which of the following are true about network layer encapsulation?
Ephermeral
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Allows the transport layer function on the destination host to reassemble segments in the right order

42. What is the netstat utility used for on a host?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
TCP

43. The three main features of routes in a routing table are?
RIP (Routing Information Protocol)
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
The source and destination port number
Destination network - next-hop - metric

44. What is the port range for dynamic or private ports
Unique
FIN
RIP (Routing Information Protocol)
49152 - 65535.

45. UDP stands for?
DNS - video-streaming - VoIP
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
User Datagram Protocol

46. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
FTP
Routers (the subnetting process)
UDP - it sends datagrams as 'best effort'

47. How many bits are in an IPv4 address?
32 - there are four octets of 8 bits each in an IPv4 address
49152 - 65535.
Routing table
Acknowledgment field significant

48. What information does a router need to successfully forward packets?
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Destination network - next-hop - metric
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route

49. Why does TCP use a sequence number in the header?
Upper
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p

50. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
32 - there are four octets of 8 bits each in an IPv4 address
Unique
Packet