CCNP/DEVCOR – 1.1 Describe distributed applications related to the concepts of front-end, back-end, and load balancing

1.1 Describe distributed applications related to the concepts of front-end, back-end, and load balancing What are the front end and the back end Generally speaking: The front end refers to what a user/client can see The back end refers to what the company/server can see The front end may refer to: A clients browser HTML/CSS/JS …

6.3 Configure, verify, and troubleshoot IPv4 and IPv6 access list for traffic filtering

IPv4 ACLs 6.3.a Standard Using the above topology, we will use standard ACLs to block (1-99) traffic. Using the implicit “deny” at the end of the ACL will reduce the amount of ACLs needed. On R1: interface GigabitEthernet1/0 ip address 10.0.0.1 255.255.255.0 ip access-group 1 out negotiation auto ! interface GigabitEthernet2/0 ip address 10.0.1.1 255.255.255.0 …

6.1 Configure, verify, and troubleshoot port security

Let’s begin with the following topology (download lab here) I have configured this topology with R1 acting as a ROAS and as a DHCP server with the DHCP pools configured for each VLAN. Router#show ip dhcp binding Bindings from all pools not associated with VRF: IP address Client-ID/ Lease expiration Type Hardware address/ User name …

5.4 Troubleshoot client- and router-based DHCP connectivity issues

In order for PC-1 to to obtain a DHCP lease from R1 there needs to be L3 connectivity from PC-1 to R1. Therefore the following needs to happen: R1 needs to be aware of the PC-1 subnet (I used RIPv2) R2 needs to be configured as a DHCP relay for the g1/0 interface R1 needs …

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

Having accurate time on interconnected devices is essential for troubleshooting, security and general sanity. Differences in time between machines even if small can lead to increased difficulty in troubleshooting. Having accurate and synchronized time on all devices should be part of the basic setup of networking devices. In this lab I used a real NTP …