cisco ccna hands on skills exam

cisco ccna hands on skills exam.1. the CoCSU/DSU is used to terminate synchronous digital circuits and provide DCE services such as clocking and synchronization. A is incorrect because the router can provide clocking only when connected to the DCE end of the cable; B is incorrect because the modem is used for asynchronous services; and D is incorrect because it is a DTE and does not provide clocking and synchronization. 2.A, B, and D are incorrect because CoWAN operates primarily at the physical and data link layers.3. The Do type field is unique to the Cisco HDLC frame format and is not present in ISO HDLC. A, B, and C are incorrect because they are present in both frame formats.4. encapsulation defaults to HDLC on Ao synchronous serial interfaces. b is incorrect because the encapsulation default is not PPP on any type of serial interface; c is incorrect because encapsulation defaults to HDLC; and d is incorrect because there is no automatic detection of encapsulation method on serial interfaces.5. CoPPP does perform error checking and correction, but does not provide quality of service. Both A and B are supported by PPP; since answer C is correct, D must be incorrect.6. boNCP negotiates the data link layer and network layer protocols that will be transported over the PPP connection. A is incorrect because LCP is responsible for establishing and monitoring PPP connections; C is incorrect because CDP is a Cisco-specific protocol that allows Cisco devices to share some basic information; and D is incorrect because PAP performs PPP authentication.7. do In the output of the command show interfaces, the status OPEN indicates that the network layer protocol negotiation was successful. A says that the status does not exist at all; B is a message that might be displayed by the command debug ppp authentication; and C indicates that the negotiation failed.8. instead of sending an encrypted password, AoCHAP sends a hash value generated by the MD5 algorithm. B, C, and D are correct for CHAP.9. bo confidentiality is provided by encryption algorithms such as DES, 3DES, and AES. A is incorrect because MD5 is an HMAC function that provides packet integrity; C is incorrect because DH is used to exchange the keys used by the encryption algorithm and the HMAC function; D is incorrect because IKE is used to create and manage keys on the VPN device.10.A and D. The two components of Easy VPN are the server and the remote end (client). B and C (gateway and host) are not EasyVPN terms at all.