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Juniper

JN0-696 · Question #7

user@host> show configuration ... security { nat { destination { pool server { address 10.100.100.1/32 port 5555; } rule-set rule1 { from zone UNTRUST; rule 1 { match { destination-address…

The correct answer is C. The UNTRUST-to-TRUST security policy must allow port 5555. After DNAT application becomes 5555.

Troubleshooting NAT

Question

user@host> show configuration ... security { nat { destination { pool server { address 10.100.100.1/32 port 5555; } rule-set rule1 { from zone UNTRUST; rule 1 { match { destination-address 192.168.100.1/32; destination-port 5000; } then { destination-nat pool server; } } } } proxy-arp { interface ge-0/0/1.0 { address { 192.168.100.1/32; } } } } policies { from-zone UNTRUST to-zone TRUST { policy allow { match { source-address any; destination-address any; application [ junos-ping tcp-5000 ]; } then { permit; } } } } zones { security-zone TRUST { interfaces { ge-0/0/2.0 { host-inbound-traffic { protocols { all; } } } } } security-zone UNTRUST { interfaces { ge-0/0/1.0 { host-inbound-traffic { system-services { ping; } } } } } } } applications { application tcp-5000 { protocol tcp; destination-port 5000; } } Your customer is attempting to reach a new server that should be accessible publicly using 192.168.100.100 on TCP port 5000, and internally using 10.100.100.1 on TCP port 5555. You notice no sessions form when the customer attempts to access the server. Referring to the exhibit, what will resolve this problem?

Options

  • AThere must be a TRUST-to-UNTRUST security policy to allow return traffic.
  • BThe NAT pool server must use port 5000.
  • CThe UNTRUST-to-TRUST security policy must allow port 5555.
  • DThe NAT rule set rule1 must match on port 5555.

How the community answered

(44 responses)
  • A
    9% (4)
  • B
    7% (3)
  • C
    82% (36)
  • D
    2% (1)

Explanation

After DNAT application becomes 5555.

Topics

#destination NAT#port translation#security policy port matching#NAT pool

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