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7 Cards in this Set
- Front
- Back
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One problem with internet security is that the same mechanisms are used for good purposes as for bad. There is great similarity between ______1______translation and man-in-the-middle attacks. ARP proxying and ARP ______2_______are very similar.
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1. address/NAT
2. poisoning |
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To switch a packet from one host to another, a layer-2 switch has to remember which ____1____ address goes with which port.
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1. MAC/ethernet
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A UDP broadcast is implemented at layer 2 as an ____1____ broadcast. This is a packet whose ____1____ address is ____2____. If two switches forward the same broadcast packet to each other, a ____3____ ensues. To prevent this, we ensure that the topology of a switched subnet is always a ____4____.
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1. ethernet/MAC
2. ff:ff:ff:ff:ff:ff 3. broadcast storm 4. tree/spanning tree |
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In dynamic NAT, outgoing requests from a private network are rewritten to have a public ____1____ address and a potentially different ____2____ for the public address. The NAT machine creates a NAT "____3____" that remembers the map from private to public.
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1. internet/IP
2. port 3. flow |
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Conversely (to dynamic NAT), in Direct-Server-Return Server Load Balancing (DSR-SLB), several servers share one ____1____ address, and network address translation occurs for the ____2____ address. Thus a flow is a map between ____2____ addresses, not between ____3____ addresses.
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1. IP
2. ethernet/MAC 3. Internet/IP |
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In TCP congestion control, a "triple duplicate ACK" for a packet means that the next packet has ____1____ been received and should be sent again. This has the side-effect of halving the ____2____ window. A so-called "slow start" for the congestion control might be a misleading name, because the congestion control window grows ____3____ during one. TCP congestion control is an ____4____ mechanism that is not aware of the state of intervening routers.
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1. not
2. congestion 3. exponentially 4. end-to-end |
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In a wireless network, an ____1____ provides a connecting point between a wired and wireless network. Typically, one of these is associated with one and only one IP subnet. "Mobile IP" refers to any mechanism whereby a roaming laptop can be known by its ____2____ address instead of the ____3____ address of the subnet it is visiting. This is accomplished via ____4____ that intercept and redirect traffic.
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1. access point/AP
2. permanent/home 3. temporary/roaming/foreign 4. agents |
