FUNDAMENTALS OF TRANSPORT APPLICATIONS & SECURITY
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| PC1 is using TCP & window size 4000. PC1 sends 4 segmts to PC2 W/ 1000 bytes data each, W/ sequence #S 2000, 3000, 4000, & 5000. PC2 replies W/ an acknwgmnt # 5000. What OUGHT PC1 do next? a.up window to 5000 b.Send next segmt c.resend 5000 d.resend all | C. TCP uses a concept called forward acknowledgment, in which the acknowledgment field in the header lists the next-expected byte, not the last-received byte. An acknowledgment of 5000 in this case means that the TCP segment with sequence number 5000 w
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| Which of the following are not features of a protocol that is considered to match OSI Layer 4? a. Error recovery b. Flow control c. Segmenting of application data d. Conversion from binary to ASCII | d
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| Which of the following header fields identify which TCP/IP application gets data received by the computer? a. Ethernet Type b. SNAP Protocol Type c. IP Protocol Field d. TCP Port Number e. UDP Port Number f. Application ID | d and e
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| Which of the following are not typical functions of TCP? a. Windowing b. Error recovery c. Multiplexing using port numbers d. Routing e. Encryption f. Ordered data transfer | d and e
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| Which of the following functions is performed by both TCP and UDP? a. Windowing b. Error recovery c. Multiplexing using port numbers d. Routing e. Encryption f. Ordered data transfer | C. TCP, not UDP, performs windowing, error recovery, and ordered data transfer. Neither performs routing or encryption.
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| What do you call data that includes the Layer 4 protocol header, and data given to Layer 4 by the upper layers, not including any headers and trailers from Layers 1 to 3? a. Bits b. Chunk c. Segment d. Packet e. Frame f. L4PDU g. L3PDU | C and F. The terms packet and L3PDU refer to the data encapsulated by Layer 3. Frame and L2PDU refer to the data encapsulated by Layer 2.
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| In the URL http://www.fredsco.com/name.html, which part identifies the web server? a. http b. www.fredsco.com c. fredsco.com d. http://www.fredsco.com e. The file name.html includes the hostname. | B. Note that the hostname is all the text between the // and the /. The text before the // identifies the application layer protocol, and the text after the / represents the name of the web page.
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| comparing VoIP with an HTTP business application, which are accurate about the quality of service needed from network? a. VoIP needs lower packet loss. b. HTTP needs less bandwidth. c. HTTP needs lower jitter. d. VoIP needs lower delay. | A and D. VoIP flows need better delay, jitter, and loss, with better meaning less delay, jitter, and loss, as compared with all data applications. VoIP typically requires less bandwidth than data applications.
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| Which of the following is a device or function whose most notable feature is to examine trends over time to recognize different known attacks as compared to a list of common attack signatures? a. VPN b. Firewall c. IDS d. NAC | C. Intrusion Detection Systems (IDS) monitor packets, comparing the contents of single packets, or multiple packets, to known combinations (signatures) that typically imply that a network attack is occurring.
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| Which of the following is a device or function whose most notable feature is to encrypt packets before they pass through the Internet? a. VPN b. Firewall c. IDS d. NAC | A. A virtual private network (VPN) is a security feature in which two endpoints encrypt data before forwarding it through a public network such as the Internet, providing privacy of the data inside the packets
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