JN0-102 · Question #216
You issue the command telnet interface ge-1/1/0 10.10.10.1 source 192.168.100.1 bypass- routing. Which statement is correct?
The correct answer is D. Return traffic for the telnet session might not arrive at interface ge-1/1/0. This question examines the implications of using the bypass-routing parameter with the telnet command, particularly concerning return traffic.
Question
You issue the command telnet interface ge-1/1/0 10.10.10.1 source 192.168.100.1 bypass- routing. Which statement is correct?
Options
- AThe bypass-routing parameter is ignored when using private IP addressing.
- BThe telnet session will have the source IP address 10.10.10.1.
- CThe telnet session will connect to the neighboring device's interface ge-1/1/0.
- DReturn traffic for the telnet session might not arrive at interface ge-1/1/0.
How the community answered
(27 responses)- A11% (3)
- B26% (7)
- C4% (1)
- D59% (16)
Why each option
This question examines the implications of using the `bypass-routing` parameter with the `telnet` command, particularly concerning return traffic.
The `bypass-routing` parameter functions independently of whether the IP addresses are private or public.
The `source 192.168.100.1` parameter explicitly sets the source IP address for the telnet session, so it will be `192.168.100.1`, not `10.10.10.1`.
The telnet session will connect to the destination IP address (`10.10.10.1`), not necessarily a specific interface on the neighboring device named `ge-1/1/0`.
When `bypass-routing` is used, the initial Telnet connection attempt is sent directly out the specified interface (`ge-1/1/0` in this case) regardless of the routing table. However, return traffic from the destination (`10.10.10.1`) will still rely on standard routing protocols and the routing table to find its way back to the source IP (`192.168.100.1`). If the routing table does not have a path back to `192.168.100.1` via `ge-1/1/0`, the return traffic may take a different path or be dropped, causing the session to fail or be incomplete.
Concept tested: Junos OS bypass-routing impact on return traffic
Source: https://www.juniper.net/documentation/us/en/software/junos/junos-cli/topics/ref/command/telnet.html
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