ネットワークエンジニアは、WAN接続に使用する新しいルーターを受け取りました。ネットワークエンジニアが新しいルーターを接続すべきレイヤーを最もよく表しているのは次のうちどれですか?
正解:C
Comprehensive and Detailed Explanation (paraphrased, aligned to N10-009):
In a spine-leaf architecture, endpoints (including servers, firewalls, and WAN/edge routers) connect to leaf switches. Leaf switches then uplink to spine switches; spine switches do not have endpoints connected directly to them. Therefore, a WAN router (an external/edge device) should connect to the leaf layer-often specifically to a "border leaf" that handles external connectivity.
Why not B. Core or D. Spine? In spine-leaf, "core" isn't a formal layer, and spines are designed only to interconnect leafs, not to terminate endpoints.
Why not A. Access? "Access" is a term from the traditional three-tier model (access-distribution-core). In modern spine-leaf language, the analogous layer for endpoint attachment is the leaf.
References (CompTIA Network+ N10-009):
Domain: Network Infrastructure - Data center and campus architectures (spine-leaf vs. three-tier), roles of leaf/spine, WAN/edge connectivity points.