Written in front: The switch is from H3C. Just sorting out some of the issues.
1. Switch workers can be divided into several categories according to the level ?
Layer 2 switch, Layer 3 switch, (Layer 4 switch)
2. What are the interface modes of the switch ?
access、trunk、hybird.
Access type ports can only belong to one VLAN, and are generally used to connect to computer ports;
Trunk type ports can allow multiple VLANs to pass through, and can receive and send packets of multiple VLANs. They are generally used for ports connected between switches;
The Hybrid type port can allow multiple VLANs to pass through, can receive and send packets of multiple VLANs, can be used to connect between switches, and can also be used to connect users' computers.
3. Can the same VLAN communicate between different switches ? If yes , please explain the method ? Can different VLANs communicate at layer 2 ? Can they communicate at layer 3 ?
The same vlan can communicate between different switches.
This can be achieved by setting the interface connecting the two switches to trunk mode. In the same way, communication can be realized at the second layer. If the switch has Layer 3 enabled, then routing must be enabled. Since routing can achieve cross-vlan access, communication can also be achieved naturally.
4. What is the default aging time of the MAC address of the H3C switch ?
MAC address aging time: 300S.
5. What is the aging time of the IP-Mac entry in the ARP table of the H3C exchange ?
The default aging time of ARP entries is 20 minutes. The arptimer aging command can modify the aging time of ARP entries.
6. The DMAC broadcast address utilized by the data link layer MAC address learning : what is it ?
FF：FF：FF：FF：FF：FF
all F
7. What is the most common way to divide VLANs ?
Port-based division
8. In what scenarios is static routing generally used ?
As a static route, it is often used in relatively small-scale networks, or in applications that have special requirements for security. In these occasions, one of the main features is that the routing information is manually maintained in real time, and the workload is not very large. Or can be accepted by users.
9. The dynamic routing protocol RIP, how many hops can it support ?
RIP is a distance vector routing protocol. The standard for measuring distance is the number of hops, which can be understood as the number of Layer 3 devices passed. The protocol stipulates that a maximum of 15 hops are supported, and the 16th hop is an unreachable route. There is a poison inversion in the RIP anti-loop mechanism, which means that a route is invalid by setting the hop count of a route to 16 hops.
10. What is the role of the ARP protocol ?
ARP, that is, Address Resolution Protocol, realizes the realization of the physical address through the IP address.
11What view is the H3C switch in by default, and what view should the configuration be in ?
Default is in user view
Configured in system view