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Category: CCNA 200-125

CCNA 6.2: Describe common access layer threat mitigation techniques

Overview: Common access layer threats include unauthorized clients connecting to a LAN, rogue DHCP servers and VLAN hopping by way of double tagging. 802.1x, DHCP snooping and Nondefault native VLAN are techniques to mitigate access layer types of vulnerabilities.   Study Notes: 6.2.a 802.1x A client-server-based access control and authentication protocol preventing unauthorized clients from […]


CCNA 6.1: Configure, verify, and troubleshoot port security

Overview: Port security can be used on an interface to identify and limit the MAC addresses of clients that are allowed to access that port.   Study Notes: Port security identifies the MAC addresses of clients allowed to forward traffic through an interface Port security is applied to access ports Port security cannot be applied […]


CCNA 5.7: Configure and verify NTP operating in a client/server mode

Overview: The Network Time Protocol (NTP) synchronizes the time of day among a set of distributed time servers and clients Study Notes: NTP synchronizes time across devices so you can correlate system logs and other time-specific events from multiple network devices NTP uses UDP as its transport protocol An NTP server normally receives its time […]


CCNA 5.6: Configure, verify, and troubleshoot inside source NAT

Overview: Inside source Network Address Translation (NAT) is used to map private IP addresses on a LAN to a public IP address(es) on the outside interface of the router   Study Notes: Inside source Network Address Translation (NAT) is used to map private IP addresses on a LAN to public IP address(es) on the outside […]


CCNA 5.5: Configure, verify, and troubleshoot basic HSRP

Overview: Hot Standby Routing Protocol (HSRP) enables high availability by providing multiple default gateways with the same virtual IP address to hosts on a LAN.   Study Notes: HSRP is a Cisco proprietary protocol HSRP routes IP traffic without relying on the availability of any single router on the LAN Multiple router interfaces work together […]


CCNA 5.4: Troubleshoot client- and router-based DHCP connectivity issues

Overview: Client and router based DHCP connectivity issues can be the result of any number of issues, but most often it is due to a misconfiguration.   Study Notes: Client and router based DHCP connectivity issues are typically the result of misconfigurations. Has the DHCP lease expired? If the lease has expired and another client […]


CCNA 5.3: Configure and verify DHCP on a router

Overview: Dynamic Host Control Protocol (DHCP) provides configuration parameters to hosts.   Study Notes: The DHCP protocol configures hosts with network settings The DHCP protocol provides other configurable parameters including conflict logging – conflicts occur when 2 hosts use the same IP address excluded addresses – range of IPs to exclude from the DHCP pool […]


CCNA 5.3.d: Configure and verify DHCP on a router – TFTP, DNS and gateway options

Overview: The Cisco IOS DHCP feature can be configured with a few optional, but recommended, commands including TFTP, DNS and Default Gateway.   Study Notes: The Cisco IOS DHCP feature can be configured with a few optional, but recommended, commands including TFTP, DNS and Default Gateway IP address. The TFTP option 150 is used to […]


CCNA 5.3.b: Configure and verify DHCP on a router – Relay

Overview: A DHCP relay agent is any host that forwards DHCP packets between clients and servers.   Study Notes: Relay agents are used to forward requests and replies between clients and servers when they are not on the same physical subnet. Relay agent forwarding is distinct from the normal forwarding of an IP router, where […]


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