Copyright 1999 James F Kurose and Keith W Ross All Rights Reserved in Java

Creation Denso QR Bar Code in Java Copyright 1999 James F Kurose and Keith W Ross All Rights Reserved
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network-layer routers For example, in the IP-over-ATM scenario, two adjacent IP routers can be connected to each other by a virtual circuit through an ATM network In such circumstances, a network that is based on one network architecture (eg, ATM, or frame relay) can serve as a single logical link between two neighboring nodes (eg, IP routers) in another network architecture Having covered the data link layer, our journey down the protocol stack is now over! Certainly, the physical layer lies below the data link layer, but the details of physical layer is the topic probably best left for another course (eg, in communication theory, rather than computer networking) We have, however, touched upon several aspects of the physical layer in this chapter (eg, our brief discussions of Manchester encoding in section 55 and of signal fading in section 57) and in 1 (our discussion of physical media in section 15) Although our journey down the protocol stack is over, our study of computer networking is not yet over In the following three chapters we cover multimedia networking, network security, and network management These three topics do not fit conveniently into any one layer; indeed, each topic crosscuts many layers Understanding these topics (sometimes billed as "advanced topics" in some networking texts) thus requires a firm foundation in all layers of the protocol stack - a foundation that is now complete with our completed study of the data link layer!
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Copyright 1999 James F Kurose and Keith W Ross All Rights Reserved
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Sections 51-53 1) If all the links in the Internet were to provide the reliable-delivery service, would the TCP reliabledelivery service be completely redundant Why or why not 2) What are some of possible services that a link-layer protocol can offer to the network layer Which of these link-layer services have corresponding services in IP In TCP 3) Suppose the information content of a packet is the bit pattern 1010101010101011 and an even parity scheme is being used What would be the value of the checksum field in a single parity scheme 4) Suppose two nodes start to transmit at the same time a packet of length L over a broadcast channel of rate R Denote the propagation delay between the two nodes as tprop Will there be a collision if tprop < L/R Why or why not 5) In section 521, we listed for desirable characteristics of a broadcast channel Slotted ALOHA has which of these charateristics Token passing has which of these characteristics 6) What are human cocktail analogies for polling, and token passing protocols 7) Why would the token-ring protocol be inefficient if the LAN has a very large perimeter 8) How big is the LAN address space The IPv4 address space The IPv6 address space 9) Suppose nodes A, B, and C each attach to the same broadcast LAN (through their adapters) If A sends thousands of frames to B with each frame adddressed to the LAN address of B, will C's adapter process these frames If so, will C's adapter pass the IP datagrams in these frames to C (ie, the adapter's parent node) How will your answers change if A sends frames with the LAN broadcast address 10) Why is an ARP query sent within a broadcast frame Why is an ARP response sent within a frame with a specific LAN address
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11) For the network in Figure 53-4, the router has two ARP modules each with its own ARP table Is it possible that the same LAN address appear in both tables 12) Compare the frame structures for 10BaseT, 100BaseT and Gigabit Ethernet How do they differ 13) Suppose a 10 Mbps adapter sends into a channel an infinite stream of 1s using Manchester encoding The signal emerging from the adatper will have how many transitions per second 14) After the 5th collision, what is the probability that the value of K that a node chooses is 4 The result K=4 corresponds to a delay of how many seconds on a 10 Mbps Ethernet 15) Does the TC sublayer at the transmitter fill in any of the fields in the ATM header Which ones Section 56 16) In the IEEE 80211 specification, the length of the SIFS period must be shorter than the DIFS paeriod Why 17) Suppose the IEEE 80211 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 Section 59 18) Does the TC sublayer distinguish between different VCs at either the transmitter or receiver 19) Why is it important for the TC Sublayer in the transmitter to provide a continuous stream of cells when the PMD Sublayer is cell based 20) Does the TC sublayer at the transmitter fill in any of the fields in the ATM header Which ones
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