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Recent questions and answers in Computer Networks
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How 5G core network architecture is designed around resilience concepts?
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Duplicate: Describe why an application developer might choose to run an application over UDP rather than TCP.
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How are different RTP streams in different sessions identified by a receiver? How are different streams from within the same session identified?
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Why is a packet that is received after its scheduled playout time considered lost?
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What is the difference between end-to-end delay and packet jitter? What are the causes of packet jitter?
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With HTTP streaming, are the TCP receive buffer and the client’s application buffer the same thing? If not, how do they interact?
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Streaming video systems can be classified into three categories. Name and briefly describe each of these categories.
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Suppose an analog audio signal is sampled 16,000 times per second, and each sample is quantized into one of 1024 levels. What would be the resulting bit rate of the PCM digital audio signal?
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Signature-based IDSs and IPSs inspect into the payloads of TCP and UDP segments. True or False?
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Why must an application gateway work in conjunction with a router filter to be effective?
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Consider a traditional (stateless) packet filter. This packet filter may filter packets based on TCP flag bits as well as other header fields. True or False?
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In WEP, an IV is sent in the clear in every frame. True or False
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Consider WEP for 802.11. Suppose that the data is 10101100 and the keystream is 1111000. What is the resulting ciphertext?
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An IKE SA and an IPsec SA are the same thing. True or False?
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Suppose Bob initiates a TCP connection to Trudy who is pretending to be Alice. During the handshake, Trudy sends Bob Alice’s certificate. In what step of the SSL handshake algorithm will Bob discover that he is not communicating with Alice?
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What is the purpose of the random nonces in the SSL handshake?
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Is the message integrity scheme based on HMAC susceptible to playback attacks? If so, how can a nonce be incorporated into the scheme to remove this susceptibility?
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What is the purpose of a nonce in an end-point authentication protocol?
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Suppose certifier.com creates a certificate for foo.com. Typically, the entire certificate would be encrypted with certifier.com’s public key. True or False
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In what way does a hash provide a better message integrity check than a checksum (such as the Internet checksum)?
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Suppose you want to encrypt the message 10101111 by encrypting the decimal number that corresponds to the message. What is the decimal number?
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From a service perspective, what is an important difference between a symmetric-key system and a public-key system?
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Internet entities (routers, switches, DNS servers, Web servers, user end systems, and so on) often need to communicate securely. Give three specific example pairs of Internet entities that may want secure communication.
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What are the differences between message confidentiality and message integrity? Can you have confidentiality without integrity? Can you have integrity without confidentiality? Justify your answer.
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Using the monoalphabetic cipher in Figure 8.3, encode the message “This is an easy problem.” Decode the message “rmij’u uamu xyj.”
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What are three approaches that can be taken to avoid having a single wireless link degrade the performance of an end-to-end transport-layer TCP connection?
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What is the role of the anchor MSC in GSM networks?
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What are the purposes of the HLR and VLR in GSM networks? What elements of mobile IP are similar to the HLR and VLR?
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What are three important differences between the 3G and 4G cellular architectures?
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How has the IEEE divided the data link
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What is the role of the eNodeB, MME, P-GW, and S-GW in 4G architecture?
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What is the role of the RNC in the 3G cellular data network architecture? What role does the RNC play in the cellular voice network?
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Consider two mobile nodes in a foreign network having a foreign agent. Is it possible for the two mobile nodes to use the same care-of address in mobile IP? Explain your answer.
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What are the differences between a master device in a Bluetooth network and a base station in an 802.11 network?
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Suppose the IEEE 802.11 RTS and CTS frames were as long as the standard DATA and ACK frames. Would there be any advantage to using the CTS and RTS frames? Why or why not
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Why are acknowledgments used in 802.11 but not in wired Ethernet?
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True or false: Before an 802.11 station transmits a data frame, it must first send an RTS frame and receive a corresponding CTS frame.
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Describe the role of the beacon frames in 802.11.
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Suppose there are two ISPs providing WiFi access in a particular café, with each ISP operating its own AP and having its own IP address block.
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What are the differences between the following types of wireless channel impairments: path loss, multipath propagation, interference from other sources?
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