1.Which two functions are primary functions of a router? (Choose two.)
packet forwarding
microsegmentation
domain name resolution
path selection
flow control
2.What are two advantages of static routing over dynamic routing? (Choose two.)
Static routing is more secure because it does not advertise over the network.
Static routing scales well with expanding networks.
Static routing requires very little knowledge of the network for correct implementation.
Static routing uses fewer router resources than dynamic routing.
Static routing is relatively easy to configure for large networks.
The Correct Answer and Explanation is :
Question 1: Primary functions of a router
The correct answers are:
- Packet forwarding
- Path selection
Explanation:
A router is a device that helps direct traffic between different networks by determining the best route for packets of data to travel across. Let’s break down these two primary functions:
- Packet forwarding: This is the process of moving data packets from one network to another based on the destination IP address. When a router receives data packets, it examines the packet’s destination address, looks at its routing table (which contains paths to various networks), and forwards the packet to the next hop toward the destination. This forwarding process happens at Layer 3 of the OSI model (the Network layer).
- Path selection: A router’s primary job is to choose the best possible path for data packets to take to their destination. The router does this by using its routing table and algorithms to evaluate different possible routes, selecting the one that will most efficiently get the data where it needs to go. Path selection can be based on static routing, dynamic routing protocols (like OSPF or BGP), or a combination of the two.
Other options:
- Microsegmentation refers to dividing a network into smaller segments but isn’t a function of routers; it’s usually related to switches.
- Domain name resolution (DNS) is handled by DNS servers, not routers.
- Flow control is the management of data transfer rate and is typically handled by other network devices or protocols, like switches or TCP.
Question 2: Advantages of static routing over dynamic routing
The correct answers are:
- Static routing is more secure because it does not advertise over the network.
- Static routing uses fewer router resources than dynamic routing.
Explanation:
Static routing is a type of routing where routes are manually configured on the router. It contrasts with dynamic routing, where routers automatically exchange routing information using protocols. Let’s examine why static routing has advantages:
- Static routing is more secure because it does not advertise over the network: Since static routes are manually set, they don’t broadcast routing information across the network like dynamic routing protocols do. This makes static routing less susceptible to certain attacks like route spoofing or route poisoning, which can occur with dynamic protocols.
- Static routing uses fewer router resources than dynamic routing: Static routing requires minimal processing power. Because no dynamic updates are constantly occurring, routers using static routes don’t need to maintain as many tables, exchange updates, or compute new routes. This means the router’s CPU and memory resources are used more efficiently.
Other options:
- Static routing scales poorly with large networks because every new route must be manually configured.
- Static routing doesn’t require much knowledge of the network, but it does require an understanding of the network topology for proper setup.
- Static routing is not easy to configure for large networks because manual configuration of every route is time-consuming and prone to errors.
In summary, static routing is simpler, more secure, and requires fewer resources, making it an attractive choice for smaller networks or networks where the topology does not change frequently. However, dynamic routing is typically better suited for larger, more complex networks that require frequent updates and automatic route calculation.