cisco ccna vs ccent

cisco ccna vs ccent.Tama buy ICMP messages are encapsulated directly into IP packet headers as IP netloads. If the IP packet is netloaded with an ICMP messagemessage, the value of the Protocol Type field in its IP packet header must be 1oICMP messages are prefixed with an ICMP header, and the ICMP header1.4 Internet Protocol and Layer 3 Technologies 71Distance vectors are exchanged between neighboring routers until a stable routing table is generated by all routers. At this point, the routing protocol reaches convergence. Routing protocol messages are also periodically exchanged between mutually neighboring routers. If the link between the neighboring routers is broken, both routers detect the failure and immediately notify their respective other neighboring routers. Each neighboring router notifies its own neighboring router of the failure, making updates to the route accordingly until the routing protocol converges again.Always contains a type field and a code field, which define the type and purpose of the ICMP message. ICMP messagesThere are multiple types, and each message type can be further classified by code field value.1.5 Internet Control Message Protocol (ICMP) 72Table 1-17 shows several common types of ICMP messages and their types and code field values. Table 1-17 Several Common ICMP Messages and Their Type and Code Field ValuesType Field Value Code Field Value Description0 I Echo Reply 0