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PASS HOTMay 2, 20203 min readWhy does TCP send RST packets twice in a row?Will the packets captured by Wireshark have two RSTs in one connection? Two RST records appeared in 247,248. Was wireshark displaying...
PASS HOTApr 19, 20203 min readWill IPv6 replace the MAC address?Although this question is a bit absurd, it is of great value for discussion. Whether it is an IPv4 or IPv6 address, it is globally unique...
PASS HOTApr 16, 20203 min readWhy should I ask TCP / IP / HTTP for these interviews?Regardless of these agreements, what is the best thing to ask? Questions about OSPF and BGP? That's the protocol used by network...
PASS HOTApr 15, 20207 min readHow to carry out network attacks on the intranet?1. Regarding the IP Spoofing attack, if the source IP of the packet is constructed by itself, how should this packet be sent out of the...
PASS HOTApr 9, 20203 min readWhy can't the host ping other hosts in the same broadcast domain?Home Internet access is NAT, and Ping is not connected to other IP on the network segment (confirm online). What isolation technology is...
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PASS HOTApr 1, 20203 min readCcna 200-301 Outline Why does the IP protocol still need the UDP protocol?Since the IP protocol can also perform connectionless and unreliable transmission of data, why do you need the UDP protocol? Protocol...
PASS HOTMar 26, 20203 min read350-401 Encor Cisco What are the basic core protocols on the Internet?For students who have studied the TCP / IP protocol, this is not a problem, the IP protocol. For the public, more explanation is needed....
PASS HOTMar 18, 20203 min readHow many packets does TCP need to receive to confirm?When the server sends data to the browser, sometimes the server sends a packet, and the browser will reply with an ACK. Sometimes the...
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PASS HOTMar 11, 20202 min read200-301 exam fee Why can't I access the Internet with a fixed IP?The network card is set to automatically obtain an IP to access the Internet, but it cannot be accessed by changing to a fixed IP. The...
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PASS HOTOct 28, 20193 min readccie r&s lab certcollection On the status of IPv6 in the financial industryThe meaning of IPv6 Beginning in the 1990s, the IETF noticed that the mainstream version of Internet addresses IPv4 was running out. In...
PASS HOTOct 18, 20195 min readCustomize what you think, ubiquitous Cisco collaboration Now more and more employees are already on the move: 1.Up to 90% of employees work outside the company's headquarters; 2.Up to 60% of...
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PASS HOTOct 9, 20195 min readThe Experience Of The CCIE R&S Exam I arrived at Cisco at 7:40 in the morning. I’m on the outside the door of the System building. At the beginning of October, Western...
