Block 3

What is the primary purpose of the core layer in Cisco's hierarchical internetworking model?

• Providing routing, filtering, and WAN access to determine how packets can access the core when necessary.

• Connecting end-user computers to the network and ensuring delivery of frames to these devices.

• Transporting large amounts of traffic reliably and quickly.

• Exercising considerable flexibility in defining network operation and implementing network policies.

What is the main purpose of the Address Resolution Protocol (ARP)?

• It facilitates routing decisions based on network congestion.

• It ensures end-to-end encryption of data packets transmitted over a network.

• It maps IP network addresses to MAC addresses to facilitate communication between devices on the same LAN segment.

• It provides message packets to report errors and other information regarding IP packet processing back to the source.

What happens when a router receives a packet on its inbound interface?

• The router immediately discards the packet if it does not recognize the source MAC address.

• The router forwards the packet to the next hop without examining its destination Network Layer protocol address.

• The router checks the packet’s destination Network Layer protocol address and determines whether it knows how to forward the packet.

• The router alters both the source and destination MAC addresses of the packet before forwarding it to the next hop.

What mechanism does BGP use for reliable message exchange?

• UDP

• ICMP

• TCP

• ARP

What is the purpose of a subnet mask in subnetting?

• To differentiate between public and private IP addresses.

• To indicate how many bits are being borrowed from the host component of an IP address.

• To determine the maximum number of hosts that can connect to a network.

• To specify the network address of a device on the network.

Why is CIDR (Classless Internet Domain Routing) used instead of traditional IP address classes?

• To simplify network administration by using fixed-size address blocks.

• To allocate IP addresses more efficiently by allowing for variable-length subnet masks.

• To assign unique IP addresses to devices based on their geographical location.

• To ensure compatibility between different types of networking hardware.

What does VLSM (Variable Length Subnet Masking) allow network administrators to do?

• Assign static IP addresses to devices on the network.

• Configure multiple subnets with different subnet masks on the same network.

• Limit the number of hosts that can connect to each subnet.

• Implement firewall rules to restrict access to certain parts of the network.

How does RIPv1 (Routing Information Protocol version 1) handle subnetting?

• Assign static IP addresses to devices on the network.

• Configure multiple subnets with different subnet masks on the same network.

• Limit the number of hosts that can connect to each subnet.

• Implement firewall rules to restrict access to certain parts of the network.

What distinguishes Border Gateway Protocol (BGP) from Interior Gateway Protocols (IGPs)?

• BGP is used for routing within a single autonomous system, while IGPs handle routing between different autonomous systems.

• BGP is primarily used for small networks, while IGPs are suitable for large-scale networks.

• BGP operates at the Data Link Layer, while IGPs operate at the Network Layer.

• BGP routes packets based on hop count, while IGPs use path length as the routing metric.

Which protocol is used for loop prevention in a network?

• PPP

• STP

• LLDP

• CDP