what is packet tracer

what is GN Gi gb! Share | 2013-08-24 23:58t hundred 3 | browse 776 times 2013-08-25 00:18# "Team Elite program-Personal high quality race ing!#The questioner is adopted by A: These three interfaces are GPRS interfaces. GI Interface GI interface is the interface between GPRS and external

. The structure of the gateway is similar to that of routers, and the interconnect layer is different. Gateways can be used both for WAN interconnection and for LAN interconnection. 3. What is Net Guard? Network guard: Is the end of the network (such as telephone) gateway

In the TCP protocol Before the communication has to go through three times handshake, the requester sends out a SYN signal request connection, the other party receives and accepts when will send an ACK message.An ACK is the meaning of a response. What is an ACK attack?Land Attack attack: In land attacks, hackers use a specially crafted SYN

; /* where the decode bytes are */unsigned char *comp; /* only used with decompression - malloc()ed */unsigned long epoch; /* epoch number, needed by DTLS1 */unsigned char seq_num[8]; /* sequence number, needed by DTLS1 */} SSL3_RECORD; Each SSLv3 record contains a type field, a length field, and a pointer to the recorded data ). In dtls1_process_heartbeat, there is a statement like this: /* Read type and payload length first */hbtype = *p

1. Packet filter Firewall2, Proxy-type firewall3. State Detection FirewallSpecific Description:1, packet filtering firewall uses the specific rules defined to filter the packet, the firewall directly obtains the packet IP source address, the destination address, the TCP/UDP source port and the TCP/UDP destination port.

: "Extract the business logic from the client software, encapsulated in the component ... Run on a server " since we know that the concept of" business logic "is the" class "that performs a particular task, what is called" extracting from the client Software "? In fact, this is the original put on the client's "clas

We have introduced a lot of DHCP content. Here we will mainly explain the content about DHCP listening. So what is DHCP listening? What should I pay attention to when setting this listener and related configurations and operations? DHCP listener: Through DHCP listening, the switch can restrict the non-trusted port on the end user port. Only DHCP requests can be s

"business logic", and what exactly is the business logic of ? So poised, in fact, this so-called "business logic" we can fully understand to perform a specific task "class ". Anatomy 2: The so-called: "Extract the business logic from the client software, encapsulated in the component ... Run on a server " since we know that the concept of" business logic "is t

Is this website I .xiaoi.com I use chromeNetwork can not catch send problem package, do not know what is used for communication, great guidance is this website http:// I .xiaoi.com/ I can't catch the packet that sends the problem using chrome Network, but I don't know

What is DHCP Snooping? This problem may not be very clear to many friends. Here we will give a brief explanation of this problem. DHCP Pnooping is a DHCP snoop. It monitors users through DHCP interaction packets between the Client and the server, and DHCP Snooping provides a DHCP packet filtering function, filter illeg

should have an IP address filtering language and can filter packets based on their nature. The nature of a data packet includes the destination and source IP addresses, protocol types, source and destination TCP/UDP ports, the ACK bit of the TCP packet, and the outbound and inbound network interfaces. A complete VPN system generally includes the following units: VPN Server: a computer or device

Summary I wanted to write a tutorial on port for a long time, and I finally put it into practice today. In fact, there are many tutorials on port introduction on the Internet, but I haven't seen any articles that really tell you what port is (maybe I didn't really see it). If you have read a lot of port tutorials, what is