# Recent questions tagged network-layering

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Which layers in the Internet protocol stack does a router process? Which layers does a link-layer switch process? Which layers do a host process?
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What is an application-layer message? A transport-layer segment? A network-layer datagram? A link-layer frame?
1 vote
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What are the five layers in the Internet protocol stack? What are the principal responsibilities of each of these layers?
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List five tasks that a layer can perform. Is it possible that one (or more) of these tasks could be performed by two (or more) layers?
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Match the following: ... $\text{P-II, Q-I, R-IV, S-III}$ $\text{P-IV, Q-I, R-II, S-III}$ $\text{P-IV, Q-I, R-III, S-II}$
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Network layer is used when data is to be delivered across network. So, for delivering within a network, there is no need for network layer (Ref: Pg-49, Computer Networks, Forouzan, 2 Edition). So in that case will Transport layer directly communicate with Data Link layer ? Or will Network layer be in picture, but do nothing other than simply passing data to Transport layer ?
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Consider the following statements with respect to application layer: S1 : Datagram is the PDU (Protocol data unit) used. S2 : There is a fixed limit on the maximum size of data that it can pass on the TCP layer. Which of the following options is correct? A Only S1 is true B Only S2 is true C Both S1 and S2 are true D Neither of S1 or S2 is true
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Hi Guys, Can anyone please list Essential and Optional functionality of each layer in TCP/IP 7-Layer model ? If some functionality is optional then which other layer/layers could handle that functionality.
1 vote
9
Match the following layers with their functionality. i. Encryption a. Data-Link Layer ii. Maintaining Synchronization Points b. Network Layer iii. Feedback Messages c. Session Layer iv. Physical Addressing System d. Presentation Layer How Maintain synchronization points is done by session layer? Correct option: $(C) i - d, ii - c, iii - b, iv - a$
1 vote
10
Why BGP is an application layer Protocol? Ref :- https://en.wikipedia.org/wiki/Border_Gateway_Protocol
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Which of the following statements is/ are true about the fragmentation which is done at network layer. (I) The offset of 1st fragment is always offset of parent. (II) The MF of last fragment is always same MF of parent. I think I is true and II is false: Explanation for II :- Host A connected to R1 ... ,80> MF = 1 packet 1.3 <20,40> MF = 0 packet 1.3's MF != MF of packet 1 In A-R1. is it correct.
12
Suppose a network:- Suppose a TCP message contains 492 B of data and TCP header is of size 20B then deliver it to IP. IP header is 20 B. Assume link A-R1 has the maximum frame size of 700 B including a frame size of 14 B, link R1-R2 can support a ... maximum of 256 B including a 12 B frame header. Then calculate the no of fragments at each link and show the format of fragments in each link.
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I got answer 12 is it Right or wrong
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A datagram network allows routers to drop packets whenever they need to. The probability of a router discarding a packet is p. Consider the case of a source host connected to the source router, which is connected to the destination router, and then to the destination ... number of (a) hops a packet makes per transmission? (b) transmissions a packet makes? (c) hops required per received packet?
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Please tell me which interface will be selected for the above IP address
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True or false - 1. In Ipv4 fragmentation can be done both at Source and intermediate routers. 2. In Ipv6 fragmentation can be done only at Source and not intermediate routers. 3. In both IPv6/4 reassembly is done only at the destination. 4. Ipv6 is connection ... - Is fragmentation done at the Source in Ipv4? Should the 1) be false since segmentation is done and hence fragmentation can be avoided?
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In this question, After fragmenting at Network2, what will be the total length field values of the 4 fragmented IP packets ?
1 vote
21
We have one 1-MB file that in 1second moved from 1Mhz channel with 60db Attenuation. if the density of power to noise be -174 dBm/Hz, the transmitter power is equal to 1Micro Watt. My question is how this value be calculated? any idea?
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Which layer of OSI reference model is responsible for decomposition of messages and generation of sequence numbers to ensure correct re-composition from end to end of the network? Physical Data-link Transport Application
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The design issue of Datalink layer in OSI Reference Model is Framing Representation of bits Synchronization of bits Connection control
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Decryption and encryption of data are responsibility of which of the following layer? Physical layer Data link layer Presentation layer Session layer