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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. Pieces of information about a route that a routing table contains
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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
53
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

2. ACK is?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Acknowledgment field significant
False. It's like a file - only one process can read/write.
UDP

3. Which of the following are true about network layer encapsulation?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
TFTP - Trivial File Transfer Protocol
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.
UDP

4. UDP does or does not create a session?
UDP
It works the same on all Layer 1 media
128
Does not

5. Port 25 is?
Upper
Dynamic / private
SMTP
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

6. SYN is?
Window size
Synchronize sequence numbers
Netstat -r and route print
TCP. It makes larger demands on a network

7. What two commands can be used to view a host's routing table?
It means ensuring that each segment that the source sends arrives at the destination
128
Netstat -r and route print
Connectionless

8. What are the transport layer's responsibilities?
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
Netstat -r and route print
1
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.

9. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
It works the same on all Layer 1 media
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
Destination network - next-hop - metric

10. What is contained in the header of each segment or datagram?
User Datagram Protocol
POP3
Transport
The source and destination port number

11. UDP stands for?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Unique
User Datagram Protocol
Upper

12. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
32 - there are four octets of 8 bits each in an IPv4 address
Window size
Dynamic / private
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

13. What does segmentation provide to communications?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Gateway
TCP. It makes larger demands on a network
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

14. Port 520 is?
TFTP - Trivial File Transfer Protocol
RIP (Routing Information Protocol)
It Doesn't - TCP does
1

15. Routers add routes for the connected networks to their ________________ .
Destination network - next-hop - metric
Routing table
Upper
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.

16. Port 443 is?
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
Allows the transport layer function on the destination host to reassemble segments in the right order
HTTPS (Secure HTTP)
49152 - 65535.

17. Ephermeral port is what type of port
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
POP3
Dynamic / private
32 - there are four octets of 8 bits each in an IPv4 address

18. What is the netstat utility used for on a host?
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
It Doesn't - TCP does
UDP - it sends datagrams as 'best effort'
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.

19. What are three key factors to consider when grouping hosts into a common network?
Purpose - ownership - and geographic location are key ways to divide a network
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
TCP
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.

20. MSN messenger uses TCP or UDP?
32 - there are four octets of 8 bits each in an IPv4 address
TCP
SMTP
Connectionless

21. What is the port range for well known ports
It Doesn't - TCP does
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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

22. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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

23. Dynamic ports fall into what category of port
TCP. It makes larger demands on a network
TFTP - Trivial File Transfer Protocol
Ephermeral
IRC

24. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Forward the packet to the default route interface (gateway) or just drop/discard the packets
All
DNS - video-streaming - VoIP

25. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
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.
Packet
Static routing
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

26. What are the three basic characteristics of IPv4?
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
Connectionless - Best effort (unreliable) - media independent
Does not
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

27. What is the purpose of TCP/UDP port numbers?
Reliable - connection-oriented protocol (resends if not received)
FIN
To track the different conversations crossing the network at the same time
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

28. Port 69 is?
UDP
Web browsing - email - file transfer
Not - these are done by other protocols in other layers
TFTP - Trivial File Transfer Protocol

29. Name the private address blocks
The default gateway address is the address of a router interface that is connected to the same network as the host.
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
TCP uses flow control
Purpose - ownership - and geographic location are key ways to divide a network

30. What is the default DNS port number?
UDP
53
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Packet

31. What information does a router need to successfully forward packets?
FTP
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
Synchronize sequence numbers
RIP (Routing Information Protocol)

32. 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?
TCP uses flow control
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

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

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34. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
It Doesn't - TCP does
Upper

35. Which of the following are true about static and dynamic routing?
TCP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Allows the transport layer function on the destination host to reassemble segments in the right order
It means ensuring that each segment that the source sends arrives at the destination

36. Port 20 is?
FTP
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
Telnet
Upper

37. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Web browsing - email - file transfer
1
All
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.

38. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Telnet
Reliable - connection-oriented protocol (resends if not received)
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
Does not

39. TCP header provides for
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

40. Why does TCP use a sequence number in the header?
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
Ephermeral
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
HTTPS (Secure HTTP)

41. 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?
All
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Gateway
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

42. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
It Doesn't - TCP does
Static routing
Connectionless
Transport

43. IP requires that each sending and receiving device have a __________ IP address.
User Datagram Protocol
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Unique

44. What is the protocol number for UDP?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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
Window size
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

45. MTU stands for ?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Maximum transmission unit
FIN
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

46. Which is a connection-oriented protocol - TCP or UDP?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
TCP
An alternate HTTP port
SMTP

47. Which of the following are not functions of the network layer?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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
SMTP
Forward the packet to the default route interface (gateway) or just drop/discard the packets

48. TCP is a ________________ layer protocol.
Transport
It Doesn't - TCP does
Not - these are done by other protocols in other layers
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

49. How does UDP keep track of sequence numbers?

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50. What is the port range for dynamic or private ports
It works the same on all Layer 1 media
49152 - 65535.
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
UDP