Cisco Certified Network Associate : 640-802 Exam p4s ccna latest version

Exam Number/Code: 640-802
Exam Name: Cisco Certified Network Associate

“Cisco Certified Network Associate”, also known as 640-802 exam, is a Cisco certification.
Preparing for the 640-802 exam? Searching 640-802 Test Questions, 640-802 Practice Exam, 640-802 Dumps?

With the complete collection of questions and answers, Pass4sure has assembled to take you through 254 Q&As to your 640-802 Exam preparation. In the 640-802 exam resources, you will cover every field and category in CCNA helping to ready you for your successful Cisco Certification.

QUESTION 45:
Although TCP segments are similar to UDP segments, TCP packets contains some
additional fields. Which of the following are found in a TCP header, but not in a
UDP header? (Choose three)
A. Checksum
B. Sequence number
C. Destination port
D. Window size
E. Acknowledgment number
F. Source port
Answer: B, D, E
Explanation:
The Figure below illustrates the fields and overall format of a TCP packet.
Twelve fields comprise a TCP packet.
TCP Packet Field Descriptions
The following descriptions summarize the TCP packet fields illustrated in Figure 30-10:
1. Source Port and Destination Port-Identifies points at which upper-layer source and
destination processes receive TCP services.
2. Sequence Number-Usually specifies the number assigned to the first byte of data in the
current message. In the connection-establishment phase, this field also can be used to
identify an initial sequence number to be used in an upcoming transmission.
3. Acknowledgment Number-Contains the sequence number of the next byte of data the
sender of the packet expects to receive.
4. Data Offset-Indicates the number of 32-bit words in the TCP header.
5. Reserved-Remains reserved for future use.
6. Flags-Carries a variety of control information, including the SYN and ACK bits used
for connection establishment, and the FIN bit used for connection termination.
7. Window-Specifies the size of the sender’s receive window (that is, the buffer space
available for incoming data).
8. Checksum-Indicates whether the header was damaged in transit.
9. Urgent Pointer-Points to the first urgent data byte in the packet.
10. Options-Specifies various TCP options.
11. Data-Contains upper-layer information.
User Datagram Protocol (UDP)
The User Datagram Protocol (UDP) is a connectionless transport-layer protocol (Layer 4)
that belongs to the Internet protocol family. UDP is basically an interface between IP and
upper-layer processes. UDP protocol ports distinguish multiple applications running on a
single device from one another.
Unlike the TCP, UDP adds no reliability, flow-control, or error-recovery functions to IP.
Because of UDP’s simplicity, UDP headers contain fewer bytes and consume less
network overhead than TCP.
UDP is useful in situations where the reliability mechanisms of TCP are not necessary,
such as in cases where a higher-layer protocol might provide error and flow control.
UDP is the transport protocol for several well-known application-layer protocols,
including Network File System (NFS), Simple Network Management Protocol (SNMP),
Domain Name System (DNS), and Trivial File Transfer Protocol (TFTP).
The UDP packet format contains four fields, as shown in the figure below. These include
source and destination ports, length, and checksum fields.
A UDP packet consists of four fields.
Source and destination ports contain the 16-bit UDP protocol port numbers used to
demultiplex datagrams for receiving application-layer processes. A length field specifies
the length of the UDP header and data. Checksum provides an (optional) integrity check
on the UDP header and data.
Reference: http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ip.htm#xtocid21
QUESTION 46:
DRAG DROP
You work as a network administrator at Certkiller .com.
Your boss, Mrs. Certkiller, is interested in the OSI layers. Match the items with the
appropriate layers. Note that not all options are used.
Answer:
QUESTION 47:
Certkiller is installing IP phones in a new office. The phones and office computers
connect to the same device. To ensure maximum throughout for the phone data
sessions, the company needs to make sure that the phone traffic is on a different
network from that of the office computer data traffic. What is the best network
device to which to directly connect the phones and computers and what technology
should be implemented on this device? (Choose two)
A. VLAN
B. Subinterface
C. STP
D. Hub
E. Switch
F. Router
G. Wireless Access Point
H. VTP
Answer: A, E

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Questions and Answers : 254 Q&As
Updated: 2008-2-27

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