350-401 · Question #279
Refer to the exhibit. A GRE tunnel has been created between HQ and BR routers. What is the tunnel IP on the HQ router?
The correct answer is A. 10.111.111.1. The tunnel IP on the HQ router is the address assigned to the logical GRE tunnel interface, establishing the virtual network segment for the tunnel.
Question
Refer to the exhibit. A GRE tunnel has been created between HQ and BR routers. What is the tunnel IP on the HQ router?
Exhibits
Options
- A10.111.111.1
- B10.111.111.2
- C209.165.202.130
- D209.165.202.134
How the community answered
(17 responses)- A76% (13)
- B6% (1)
- C12% (2)
- D6% (1)
Why each option
The tunnel IP on the HQ router is the address assigned to the logical GRE tunnel interface, establishing the virtual network segment for the tunnel.
For a GRE tunnel, each end of the tunnel is configured with an IP address that resides within a common, usually private, subnet (e.g., 10.111.111.0/30). If 10.111.111.1 is provided as the correct choice, it represents the IP address assigned to the tunnel interface on the HQ router, which is distinct from the physical interface IP addresses.
10.111.111.2 would typically be the tunnel IP address assigned to the tunnel interface on the *other* end of the point-to-point GRE tunnel (e.g., the BR router).
209.165.202.130 is likely the public IP address of the physical interface on one of the routers, which serves as the tunnel *source* or *destination*, not the logical tunnel interface IP itself.
209.165.202.134 is likely another public IP address for a physical interface, either on the same router or the other end, but not the GRE tunnel interface IP address.
Concept tested: GRE tunnel interface IP addressing
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/15-mt/ir-15-mt-book/ir-tunnel-int-cfg.html
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