PASSHOT Latest Cisco CCNP Enterprise 300-435 ENAUTO Dumps Explanation

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What is the difference between MTU and PMTU?

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MTU (Maximum Transmission Unit) The maximum transmission unit is used to notify the other party of the maximum size of the data service unit that can be accepted, and to indicate the size of the payload that the sender can accept. Both Ethernet and 802.3 have a limit on the length of the data frame, and their maximum values  are 1500 bytes and 1492 bytes, respectively. This characteristic of the link layer is called MTU, which is the maximum transmission unit. Most types of networks have an upper limit on the length of several frames. If there is a datagram to be transmitted in the IP layer, and the length of the data frame is greater than the MTU of the link layer, then the IP layer needs to be fragmented (fragmentation), that is, the datagram is divided into dry slices, so that each slice is smaller than MTU. Different data links have different maximum transmission units (MTU). Since the IP protocol is the upper layer of the data link, it must be able to be used wi...
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SND/ONC Collection ccie sp 4.1 lab topology

1. Question: What is the difference between the SDN Cloud Campus Access Mode and the Kernel Mode? Answer: Access mode: Using a port security scheme, legitimate users form static ip+mac bindings on the port.      Gateway mode: Turns off dynamic arp learning capabilities and legitimate users adopt static arp bindings. 2. Question: Does the SDN need to change the IP address of the cluster IP before it can be authorized before it can be authorized? Answer: Needed 3. Question: Access control and under what circumstances will be on the pending list Answer: (1) First access      (2) IP conflict      (3) IP/VLAN inconsistencies      (4) IP changes      (5) Position change      (6) Gateway ARP spoofing 4. Question: Access control kernel mode and gateway device receives the ARP information of the unadmitted terminal, how to ...
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What is the process of packets from entering the router to outgoing?

Let me talk about my understanding first, if there is a mistake, please correct it! First, a data packet comes over, the router's network interface will determine a frame through the special marks of the frame header and the frame end and do a CRC check on the frame. If the check is unsuccessful, the frame is discarded. If the check is successful, the frame is stripped. The header and the end of the frame are put into the buffer queue of the network layer. The network layer will decrement the TTL of the IP datagram by one, recalculate the header checksum and other operations, and query the forwarding table to find the network interface to which the packet should go. Then put it into the output buffer of the interface, and the data link layer will add a new destination (next hop) MAC address, source (local router) MAC address, and IP type (such as IPv4) for this IP datagram. Calculate a wave, add an FCS at the end of the frame, and then send the frame through the physical layer. ...
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