Computer Network Protocols

Client Requesting Service

• A client packet with a destination port number of 143 is requesting the IMAP (Internet Message Access Protocol) service.

MAC Sublayer Functions

• The MAC sublayer performs the following functions to facilitate Ethernet communication:
  • Handles communication between upper layer networking software and Ethernet NIC hardware.
  • Implements trailer with frame check sequence for error detection.
  • Adds Ethernet control information to network protocol data.
  • Places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame.

Banner Configuration Testing

• To test whether a banner is properly configured on a Cisco device, a network administrator can exit global configuration mode and press Enter.

Transport Input SSH Command

• The transport input ssh command on the switch vty lines requires a username/password combination for remote access and enables encrypted communication between the switch and remote users.

IPv6 Subnet ID

• The subnet ID associated with the IPv6 address 2001:DA48:FC5:A4:3D1B::1/64 is 2001:DA48:FC5:A4::/64.

SLAAC Configuration

• After an IPv6 address is generated and applied to the interface using SLAAC, the client must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network.

IPv6 Link-Local Addresses

• The range of link-local addresses that can be assigned to an IPv6-enabled interface is FE80::/10.