GSEC · Question #32
Which of the following statements best describes where a border router is normally placed?
The correct answer is D. Between your ISP and your external firewall. A border router sits at the outermost edge of the network, connecting the organization to the ISP before traffic reaches the external firewall.
Question
Which of the following statements best describes where a border router is normally placed?
Options
- ABetween your firewall and your internal network
- BBetween your firewall and DNS server
- CBetween your ISP and DNS server
- DBetween your ISP and your external firewall
How the community answered
(48 responses)- A2% (1)
- B13% (6)
- C4% (2)
- D81% (39)
Why each option
A border router sits at the outermost edge of the network, connecting the organization to the ISP before traffic reaches the external firewall.
A router between the firewall and the internal network describes an internal distribution or core router, not a border router.
Border router placement is defined by its relationship to the ISP connection, not to the location of the DNS server.
The border router sits on the organization's side of the ISP link and connects to the firewall, not directly to the DNS server.
The border router is the first device inside the organization that terminates the ISP link; it handles BGP or static routing with the upstream provider and passes traffic inward to the external firewall, establishing the classic layered perimeter of ISP - border router - firewall - internal network. Placing it here ensures routing decisions are made before security policy enforcement begins.
Concept tested: Network perimeter architecture and border router placement
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Security/Baseline_Security/securebasebook/sec_chap2.html
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