Juniper JN0-636 Exam With Confidence Using Practice Dumps

• The SRX Series device is performing both source and destination NAT on this session because the traceoptions output shows that both source and destination IP addresses and ports are translated. The source IP address 192.168.5.2 is translated to 192.168.100.1 and the destination IP address 1.1.1.1 is translated to 192.168.5.1. The source port 0 is translated to 14777 and the destination port 80 is translated to 80. The traceoptions output also shows the rule and pool IDs for both source and destination NAT: 2/32770 and 1/1 respectively.
• This is the first packet in the session because the traceoptions output shows the flag flow_first_packet, which indicates that this is the first packet of a new session. The traceoptions output also shows the flag flow_first_src_xlate and flow_first_rule_dst_xlate, which indicate that this is the first time that source and destination NAT are applied to this session.

References:

• traceoptions (Security NAT) | Junos OS | Juniper Networks
• [SRX] How to interpret Flow TraceOptions output for NAT troubleshooting

The exhibit shows the output of the "show interfaces ge-0/0/5.0 extensive" command on an SRX Series device. The output includes a section called "Security" that lists the protocols that are allowed on the ge-0/0/5.0 interface. The protocols that are allowed on the ge-0/0/5.0 interface are:

• OSPF
• DHCP
• NTP

It's important to notice that the output don't have IBGP, IPsec, so these protocols are not allowed on the ge-0/0/5.0 interface.

According to the Juniper documentation, reflexive NAT is a type of source NAT that allows an internal host to communicate with an external host using a single public IP address and port. The reflexive NAT session is created when the internal host initiates the traffic to the external host, and the session is deleted when the traffic stops. The reflexive NAT session is bidirectional, meaning that the external host can send traffic back to the internal host using the same public IP address and port that the internal host used to reach the external host. However, the external host cannot initiate a new session to the internal host using the same public IP address and port, unless the internal host has already established a session with the external host. Therefore, only the Internet host that the internal host originally communicated with can initiate traffic to reach the internal host using the 203.0.113.1 address, a random source port, and destination port 54311. References: [Configuring Reflexive NAT]