Intro Cyber U7 Review Switching & Routing

Which of the following allows incoming traffic addressed to a specific port to move through the firewall and be transparently forwarded to a specific host on the private network?

• OSPF

• Dynamic NAT

• IP masquerade

• DNAT

Answer explanation

DNAT allows incoming traffic addressed to a specific port to be transparently forwarded to a specific host on the private network.

Which level of the OSI model does a Layer 2 switch operate at?

• Network layer

• Session layer

• Data Link layer

• Transportation layer

Answer explanation

A Layer 2 switch operates at the Data Link layer of the OSI model. It is responsible for forwarding data packets based on MAC addresses.

Which of the following BEST describes dynamic routing?

• Routing entries are manually added to routing tables.

• Routing is done within an autonomous system.

• Routers learn about networks by sharing routing information with each other.

• Routing is done between autonomous systems.

Answer explanation

Dynamic routing is the process where routers learn about networks by sharing routing information with each other.

Which of the following is true about Network Address Translation?

• It supports up to 5,000 concurrent connections.

• It allows external hosts to initiate communication with internal hosts.

• It provides end-device to end-device traceability.

• It cannot forward DNS requests to the internet.

Answer explanation

Network Address Translation supports up to 5,000 concurrent connections.

What are the main differences between the OSPF and IS-IS routing protocols?

• OSPF requires an area 0, while IS-IS does not.

• OSPF is a link state protocol, while IS-IS is not.

• OSPF is an IGP routing protocol, while IS-IS is a BGP routing protocol.

• OSPF is a classful protocol, while IS-IS is a classless protocol.

Answer explanation

The main difference between OSPF and IS-IS is that OSPF requires an area 0, while IS-IS does not.

Which of the following best describes DHCP scope exhaustion?

• When a DHCP snooping technique is used to drop packets from untrusted DHCP servers.

• When IP address lease times on a DHCP server are shortened.

• When an attacker adds a second DHCP server to a network and offers IP addresses to clients wanting to join the network.

• A denial of service from a lack of IP addresses in a DHCP server's pool.

Answer explanation

DHCP scope exhaustion is a denial of service caused by a lack of IP addresses in the DHCP server's pool.

You manage a single subnet with three switches. The switches are connected to provide redundant paths between themselves. Which feature prevents switching loops and ensures that there is only a single active path between any two switches?

• PoE

• 802.1x

• Trunking

• Spanning Tree

Answer explanation

Spanning Tree prevents switching loops and ensures a single active path between switches.

Which of the following BEST describes port aggregation?

• Multiple VLANs traveling through a single port.

• IEEE network standard 802.3.

• Multiple ports linked together and used as a single logical port.

• A priority-based flow control that allows you to prioritize network traffic.

Answer explanation

Port aggregation is the process of linking multiple ports together to function as a single logical port. This allows for increased bandwidth and redundancy in network connections.

You have just connected a new computer to your network. The network uses static IP addressing. You find that the computer can communicate with hosts on the same subnet, but not with hosts on a different subnet. No other computers are having issues. Which of the following configuration values would you MOST likely need to change?

• Default gateway

• DNS server

• IP address

• Subnet mask

Answer explanation

To communicate with hosts on a different subnet, you need to change the default gateway configuration value.

Which device is NAT typically implemented on?

• ISP router

• RADIUS server

• Default gateway router

• AD server

Answer explanation

NAT is typically implemented on the default gateway router. It allows private IP addresses to be translated to public IP addresses for internet communication.