Computer Networks

HP-UX Secure Shell defaults to the SSH-2 protocol, which is much more secure and robust than the older, deprecated SSH-1 protocol.

IP multiplexing (or IP aliasing) on a UNIX host refers to assigning and binding multiple IP addresses to a single physical network interface card.

IPFilter on HP-UX 11i v3 creates extensive logs for auditing, supports legacy X.25 interfaces (important for enterprise networks), and provides Network Address Translation (NAT) capabilities. It is not installed/enabled by default (requires setup), and the configuration is primarily text-based through ipf rules files, not a GUI tool.

The arp command is used to display and manipulate the Address Resolution Protocol (ARP) cache, which maps IP addresses (Internet) to physical MAC addresses (Ethernet).

NFS version 4 introduces strong integrated security (via Kerberos), integrated file locking (eliminating NLM), and operates over a single TCP port (2049), which greatly simplifies firewall configuration.

Apache HTTP Server listens on port 80 by default for HTTP connections. This is the standard well-known port for unencrypted web traffic. Port 8080 is commonly used as an alternate port, port 25 is for SMTP, and port 83 is not a standard service port.

The mod_imap module handles server-side image maps (clickable regions in images for navigation), not the IMAP email protocol. Despite the confusing name, it's for image map processing.

The mod_ssl module is the standard Apache HTTP Server module that provides strong cryptography for the server via the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols.

IRC stands for Internet Relay Chat, a protocol for real-time text messaging communication. It enables users to join channels (chat rooms) or send private messages. IRC predates modern instant messaging and was foundational to online chat culture. It's 'Relay Chat', not 'Relay Channel'.

Private IP addresses for local networks are defined in RFC 1918. 192.168.0.0/16 is one such range, making 192.168.1.100 a valid local network address. The other options are public IP addresses - 74.125.127.100 belongs to Google, 69.72.169.241 is also public, and 209.131.36.100 is a Yahoo address.

This is a webMethods Broker Server-specific configuration question. The correct default port is implementation-specific and would be found in product documentation.

Neighbor Discovery (ND) is a core component of IPv6 protocol suite, replacing ARP's functionality in IPv4 networks. ND operates at the link layer to discover and maintain neighbor relationships on the same network segment. DHCP is for address configuration, ARP is IPv4-only, and OSPF is a routing protocol.

The netstat command displays the network routing table along with other network statistics and connections. nwmgr is a network management tool, lanscan scans LAN interfaces, and ifconfig configures individual network interfaces but doesn't display the full routing table.

HP-UX uses SSH-2 as the default protocol for Secure Shell connections. SSH-2 is the current standard version with improved security over SSH-1. SSH-3 does not exist as a standard protocol version, SSH-AES is a cipher option not a protocol version, and OpenSSH3 refers to software version not protocol version.