In order to prevent hackers using DDOS attacks against tcp syn-type servers, Cisco added the 12.4IOS characteristics of TCP Intercept HACKER — R2 — server (1.1.1.1) If a hacker to server after R2 launched DDOS type tcp syn flood attacks, launched a large number of half-open TCP session, trying to run out of server-side resources, [...]
Archive for July, 2009
July 22nd, 2009 - 2:40 am ≡ by admin ≡ in Micorsoft Certification
Fee for Microsoft Mailing the paper certificate
Since Microsoft start using Electronic Certificate Microsoft is now formally introduced a certificate of mailing paper details the specific charges: Microsoft certificate of posting from the minimum cost of 10 U.S. dollars, in the framework of six certificates, one for each additional fees and charges for one U.S. dollars. For you to participate in MCITP: [...]
July 18th, 2009 - 2:18 am ≡ by admin ≡ in IT Technology
RPF Check
RPF Check: In order to forward a multicast datagram, a router checks if the packet is received on the interface it would use to forward a unicast packet back to the source ==>If the RPF check succeeds, the router forwards the packet ==>If the RPF check fails, the packet silently discarded Reverse Path Forwarding IP [...]
July 17th, 2009 - 4:02 am ≡ by admin ≡ in IT Technology
ASA VPN load-balancing
vpn load-balancing (VCA) (PIX 7.0 does not support, as well as more than ASA5520 support only) (does not support A / A) vpn load-balancing of the remote client only to initialize the following conversation valid (as well as remote vpn only able to provide easy vpn load) • Cisco VPN Client (Release 3.0 and later) [...]
July 16th, 2009 - 2:14 am ≡ by admin ≡ in CCA
The top of Cisco Certificate: CCA(Cisco Certified Architect)
Cisco has released a new certification: CCA, the full name is Cisco Certified Architect, is a more advanced than the CCIE certification. CCA test conditions is very high, the examination fee of U.S. 15,000 to say the least, must have a CCIE or CCDE the title and 10 years relevant industry experience. CCIE candidates who [...]
July 15th, 2009 - 8:16 am ≡ by admin ≡ in IT Technology
Storm Control
Understanding of storm control Storm control to prevent the switch port is the LAN broadcast, multicast, or a physical port unicast storm damage. Turmoil in the local area network packets flooding in the local area network, the establishment of the excessive traffic and the loss of network performance. Errors in the protocol stack or network [...]
July 11th, 2009 - 2:54 am ≡ by admin ≡ in IT Technology
Difference between LSA 5 and LSA 7
Difference between LSA 5 and LSA 7 To provide the ability of carrying external routes originated in the NSSA, a new LSA type was defined, Type 7 LSA. It has the structure and semantics of a Type 5 (External) LSA, with a two differences: 1.Type 7 LSAs can be originated and propagated within the NSSA, [...]
July 10th, 2009 - 2:35 am ≡ by admin ≡ in IT Technology
Analysing CCNA 640-802 EIGRP examination
LAB: CCNA 640-802 EIGRP Question# After adding RTR_2 router, no routing updates are being exchanged between RTR_1 and the new location. All other inter connectivity and internet access for th e existing locations of the company are working properly. The task is to identify the fault(s) and correct the router configuration to provide full connectivity [...]
July 9th, 2009 - 3:43 am ≡ by admin ≡ in IT Technology
Switch setting: IP-MAC binding
Cisco in the following three options, Option 1 and Option 2 is the same as the function of the realization, that is, the specific binding of the switch port on the host-specific MAC address (network card hardware address), Option 3 is the specific At the same time, the switch port on the host-specific binding of [...]
July 7th, 2009 - 3:17 am ≡ by admin ≡ in Micorsoft Certification
Microsoft reduced MCDBA MCAD and MCSD examination fees for $30
Microsoft in 1992 from the stock market in China will be the test subjects in order to reduce the examination fees for candidates in need of feedback, which is the recent significant increases in Cisco examination fees in sharp contrast, Microsoft’s implementation of the mainland is the most candidates examination policy preferences (125 U.S. dollars [...]