Refer to the exhibit. Routers R1 and R2 have been configured with PPP. CHAP authentication is configured, but for some reason communication cannot be established between them. <div><img src="https://skillset.s3.amazonaws.com/img/question/51411/555f6201 ...
![PPP Operation (3.2) > Cisco Networking Academy Connecting Networks Companion Guide: Point-to-Point Connections | Cisco Press PPP Operation (3.2) > Cisco Networking Academy Connecting Networks Companion Guide: Point-to-Point Connections | Cisco Press](https://www.ciscopress.com/content/images/chap3_9781587133329/elementLinks/03fig19_alt.jpg)