Computer Networks

When using the local naming method in Oracle Net Services, the service name provided by the client is resolved by looking up a connect descriptor in the tnsnames.ora file. This connect descriptor contains the protocol, host, port, and service name information needed to establish the connection. The connect identifier is what the user provides, while the connect string is the full resolution path. Option D is a distracter - there is no such thing as a Connected Directory in Oracle networking.

The Domain Name System (DNS) is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network. An oft-used analogy to explain the Domain Name System is that it serves as the phone book for the Internet by translating human-friendly computer hostnames into IP addresses. For example, the domain name www.example.com translates to the addresses 192.0.43.10 (IPv4) and 2001:500:88:200::10 (IPv6).

Oracle Connection Manager provides connection concentration and multiplexing, allowing hundreds of clients to share fewer server connections. Dedicated Server would require one server process per client (not scalable), Directory Naming is for service resolution, and Heterogeneous Services is for non-Oracle database access.

HTTP does not consider the previous request. It does not maintain any information about the state, hence it is called stateless.

This protocol in internet is responsible for handling the address of destination computer so that each packet is routed to its proper destination.

All the given options are incorrect.Answer: 5

The protocols are the set of rules that govern the transfer of data. They define how computers identify one another on a network, the form that the data should take in transit, and how this information is processed once it reaches its final destination.

SMTP stands for Simple Mail Transfer Protocol.

The correct answer is B because routers use longest prefix match first - they look for the most specific route (longest subnet mask) that matches the destination IP. AD (administrative distance) is used only when multiple routes exist for the exact same prefix. Bandwidth and metric are considered later in the selection process.

The correct answer is D because in a routed network, the source MAC address of frames received by a host is the MAC address of the router interface through which those frames arrived (E0 in this case). This occurs because the router re-encapsulates the packet with its own MAC address as the source when forwarding frames to the destination network.

The administrative distance for OSPF routes is 110 by default. If a router has multiple routes from different routing protocols for the same destination, the route with the lowest administrative distance is chosen, regardless of the metrics of the other routes.

A routing table entry contains the destination network address, subnet mask, next-hop address (or exit interface), and administrative distance/metric. The next-hop address is a critical component that tells the router where to forward packets for that destination network. MAC addresses and Layer 4 port numbers are not routing table components.