ccna on edx

ccna on edx.7 Turn off SNMP or use SNMPv3. SNMP is a protocol used to automatically monitor and manage network devices remotely. If you do not need to use SNMP, turn it off. Previous versions of SNMPv3 transmit information in clear text, which is a security risk. It is recommended that you use the more secure SNMPv3 to manage network devices. The relevant configuration is described in this chapter.8 VLAN hopping can be mitigated by disabling DTP negotiation, manually configuring Trunk links, configuring ports in access mode, configuring NativeVLANs as non-existent VLANs, and disabling traffic on Native VLANs on Trunk linksChapter 20 Network Security and Monitoring .387.Attacks. See Chapter 8 for related configurations. VLAN hopping attacks are typically implemented using either of the following two methods.. DTP-based VLAN hopping attack: The attacker's host actively sends DTP negotiation packets. because the default DTP operating mode of the Cisco switch's ports is dynamic auto. when it receives DTP packets. it automatically negotiates to become a Trunk link. after which the attacker can send data frames carrying different VLAN tags to achieve the purpose of attacking hosts in different VLANs. The attacker can then send frames carrying different VLAN tags, thus achieving the purpose of attacking hosts of different VLANs.. Double-tagged VLAN hopping attack: The attacker's host sends a data frame belonging to the NativeVLAN of the Trunk link from the port of the switch with port mode access, and if the frame contains IEEE802.lq double tags, where the outer tag is the ID of the NativeVLAN and the inner tag is the ID of the VLAN that the attacker wants to attack, then when the When the data frame passes through the Trunk link, the switch will strip the outer VLAN tag and send the data frame containing the inner tag to the Trunk link, so as to achieve the purpose of attacking different VLAN hosts.20.2 Overview of AAA and IEEE 802.1x20.2.1 Introduction to AAAAAA stands for Authentication, Authorization, and Accounting, and is a management mechanism for network security that provides three functions: authentication, authorization, and accounting, as described below.Authentication: Confirm the identity of the user accessing the network device and determine whether the visitor is a legitimate user.