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on 20-Feb-2019 (Wed)

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Flashcard 3836206255372

Question
In linux, in networking, IP packets (data send between two programs on different machines) come in three types: TCP, [...] and ICMP
Answer

UDP

^^ User Datagram Protocal


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25. Introduction to IP
is essential to know how to inspect and test your network to resolve problems. The standard UNIX utilities are explained here. 25.10.1 ping The ping command is the most common network utility. <span>IP packets come in three types on the Internet, represented in the Type field of the IP header: UDP, TCP, and ICMP. (The first two, discussed later, represent the two basic methods of communication between two programs running on different machines.) ICMP stands for Internet Control Message Protocol







Flashcard 3836209401100

Question
In linux, in networking, IP packets (data send between two programs on different machines) come in three types: TCP, UDP and [...]
Answer

ICMP

^^ Internet Control Message Protocal

^^^ ICMP, is used to check connection between two machines via ping


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25. Introduction to IP
ed in the Type field of the IP header: UDP, TCP, and ICMP. (The first two, discussed later, represent the two basic methods of communication between two programs running on different machines.) <span>ICMP stands for Internet Control Message Protocol and is a diagnostic packet that is responded to in a special way. Try: ping metalab.unc.edu or specify some other well-known host. You will







Flashcard 3836212546828

Question
In linux, in netwokring, if you want to check that your network interface is configured correctly and you can communicate with other machines on the LAN or internet, you user the [...] command, which sends a packet every second and measures the time it takes to receive the return packet.
Answer
ping

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25. Introduction to IP
often the acid test of whether you have a correctly configured and working network interface. Note that some sites explicitly filter out ICMP packets, so, for example, ping cnn.com won't work. <span>ping sends a packet every second and measures the time it takes to receive the return packet--like a submarine sonar ``ping.'' Over the Internet, you can get times in excess of 2 seconds if the place is remote enough. On a local LAN this delay will drop to under a millisecond.







Flashcard 3836215692556

Question
In linux, what exacly does the ping command do?
Answer
It sends an ICMP (Internet Control Message Protocal) packet to target host url/dns and measures how long it takes for the acknowledgement ICMP packet from the target to return.

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25. Introduction to IP
s in excess of 2 seconds if the place is remote enough. On a local LAN this delay will drop to under a millisecond. If ping does not even get to the line PING metalab.unc.edu ..., it means that <span>ping cannot resolve the host name. You should then check that your DNS is set up correctly--see Chapter 27. If ping gets to that line but no further, it means that the packets are not gettin







Flashcard 3836219362572

Question
In linux, you can use the [...] command to see how many machines a packet will go through until it reaches the final destination url/dns.
Answer

traceroute

^^ e.g. you run "traceroute cnn.com" to see how many machines your packet goes through before reaching cnn.com

^^^traceroute by default sends a UDP packet to the target host (unless you use the -I command, to send an ICMP packet instead)


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25. Introduction to IP
it means that the packets are not getting there or are not getting back. In all other cases, ping gives an error message reporting the absence of either routes or interfaces. 25.10.2 traceroute <span>traceroute is a rather fascinating utility to identify where a packet has been. It uses UDP packets or, with the -I option, ICMP packets to detect the routing path. On my machine, traceroute metalab.unc.edu gives 5 10 15 20 traceroute to metalab.unc.edu (152.19.25







Flashcard 3836222508300

Question
In linux, the [...] command can be used to see infomation about all the packets being sent and received by your machine's network interface, eth0 (specifically, you can see when exactly are packets being sent and received and to/from which hosts)
Answer
tcpdump

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25. Introduction to IP
.S. markets: there isn't even the network speed to load such servers, thus making any kind of server speed comparisons superfluous.] (or hops) between mine and metalab.unc.edu . 25.10.3 tcpdump <span>tcpdump watches a particular interface for all the traffic that passes it--that is, all the traffic of all the machines connected to the same hub (also called the segment or network segment). A network card usually grabs only the frames destined for it, but tcpdump puts the card into promiscuous mode, meaning that the card is to retrieve all frames regardless of their destination hardware address. Try tcpdump -n -N -f -i eth0 tcpdump is also discussed in Section 41.5. Deciphering th







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No matter what B2B product you are selling, a phone system, a recruiting system, or cloud storage, an SMB company will typically hit a trigger point will that create a need for that product. At RingCentral, it was when a company opened a new office or their existing phone system broke. At Taleo it was when a company reached 500 employees, and email no longer served as a good applicant tracker. There is a point of growth or business circumstance that a company hits that triggers the demand for your product. Figure out what that is, identify companies with this characteristic, and message to the need created by this trigger.
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the frequency of correctness does not matter; it is the magnitude of correctness that matters
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This behavioral fact means that people are a lot happier when they are right frequently. What’s interesting is that being right frequently is not necessarily consistent with an investment portfolio that outperforms its benchmark
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The percentage of stocks that go up in a portfolio does not determine its performance, it is the dollar change in the portfolio. A few stocks going up or down dramatically will often have a much greater impact on portfolio performance than the batting average.
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