Ospfospf has the functions and scope of which types of lsa are produced by WHO; Why do you want to divide the region? What's the role? The difference and function between sub-region and nssa region; Interactive process of ospf protocol messages; Ten routing principles of ospf state machine bgpbgp; Routing rules of ibgp and ebgp; How to prevent the commonality of bgp in the bgp area and the outer loop of BGP area; And the concept of igp synchronization in bgp; Bgp state machine and message type rip know rip is a distance vector protocol; Understand the difference between rip v 1 and rip v2; And several methods of rip to prevent loop (horizontal division, toxicity reversal) ppp protocol ppp mainly completes those tasks in lcp stage and lpcp stage; The difference and verification process of pap/chap verification; Two stages and main functions of pppoe protocol; How does ppp prevent loop qos? Understand the basic concepts of traffic supervision, traffic shaping, pq, cbp and message priority marking. Ipsec understands that ipsec consists of two protocol families: AH \ ESP. Understand the difference between ah and esp in message encryption and message encapsulation; Understand the difference between transmission mode and tunnel mode of ipsec; Understand the difference between main mode and savage mode in networking; Familiar with the basic configuration of ipsec; It's best to see how to realize nat traversing l2tp to understand the basic configuration of lac-lns. Use udp 170 1 port; The differences between pim-dm and pim-sm in common networking modes (different application scope, different multicast routing implementation methods); The difference between igmp v 1, v2 and v3; The role of vlanvlan; The vlan of H3c is mainly realized by 802. 1q protocol, and the switch port attributes are divided into access relay hybrid. The processes and differences when processing vlan tag messages of interfaces are stp\rstp\mstp Spanning Tree Protocol, Fast Spanning Number Protocol and Multi-Spanning Number Protocol (rstp is better than stp; What is the improvement of mstp over rstp); Familiar with the types of generated ports (root port, designated port, optional port, backup port) and their meanings; What are the states of the generation number protocol interface? If vrrp interacts, be familiar with vrrp protocol messages; Understand the difference between occupation and non-occupation; Arp understands the role of arp and free arp, and understands that arp requests are broadcast and arp replies are unicast; Understand the principle of arp spoofing and the solution (both parties bind ip+mac). Familiar with the concept of firewall area (trusted area, untrusted area, dmz area, etc.). ). Understand the principle of aspf security state detection protocol; Familiar with access control list configuration, namely acl configuration; Also, it is best to be familiar with the characteristics of some h3c main network products, such as ar 18 series, ar28/46 series, msr20/30/50 series (v5 platform), ne 05/08/ 16/20/40 series Exchange 3100. 5600), 6500 series (renamed as 7500), 8500 series (renamed as 9500), and if you know the non-backbone network protocols and equipment, it is best (not required) to be familiar with the interactive flow of h323\sip protocol; Familiar with common voip networks; Understand fxo, fxs, e 1vi, em and interface; Familiar with common voice signaling r2, pri wireless network and wireless fidelity 802. 1 1a, 802. 1 1b, 802.1/g; Understand the common wireless security protocols web, wpa, PSK802.1x.

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