N10-008 Exam Dumps - CompTIA Network+ Exam

When a user is unable to perform a reverse DNS lookup of an IP address to a hostname, the missing DNS record type is the PTR (Pointer) record. Here’s what you need to know:

• PTR (Pointer) Record:

Syslog is a protocol that provides a standard way for network devices and applications to send event messages to a logging server or a security appliance. Syslog messages can contain information about security incidents, errors, warnings, system status, configuration changes, and other events. A security appliance that is correlating network events from multiple devices can rely on Syslog to receive event messages from different sources and formats. References: https://www.comptia.org/blog/what-is-syslog

Layer 4 is where TCP/IP port numbers identify which network application is receiving the packet and where it is applied. Layer 4 is also known as the transport layer in the TCP/IP model or the OSI model. The transport layer is responsible for providing reliable or unreliable end-to-end data transmission between hosts on a network. The transport layer uses port numbers to identify and multiplex different applications or processes that communicate over the network. Port numbers are 16-bit numbers that range from 0 to 65535 and are divided into three categories: well-known ports (0-1023), registered ports (1024-49151), and dynamic ports (49152-65535). Some examples of well-known port numbers are 80 for HTTP, 443 for HTTPS, and 25 for SMTP. References: [CompTIA Network+ Certification Exam Objectives], Transport Layer - an overview | ScienceDirect Topics

• The question describes a scenario where a network event is causing all communication to stop, and the network administrator can only access the switch using the serial console port, not SSH.
• This suggests that the problem is related to the network layer or below, as SSH operates at the application layer and requires network connectivity to function.
• The port statistics show a huge discrepancy between the total receive and transmit rates, as well as the unicast and broadcast/multicast packets per second. This indicates that there is a lot of traffic being generated and forwarded within the network, but not reaching the intended destinations.
• The most likely cause of this excessive traffic is a switch loop, which occurs when there are multiple paths between switches that create a circular flow of data. Switch loops can cause broadcast storms, MAC address table instability, and network congestion, leading to network outages.
• To verify this, the network administrator should use a tool such as Spanning Tree Protocol (STP), which is designed to prevent and detect switch loops by blocking redundant links and electing a root bridge. STP can also provide information about the topology and status of the network, such as the root port, designated port, and blocked port for each switch. References:
• CompTIA Network+ N10-008 Study Guide, Chapter 2, Section 2.3, Switching Technologies, page 741
• Professor Messer’s CompTIA N10-008 Network+ Course Notes, Section 2.3, Switching Technologies, page 132
• Professor Messer’s CompTIA N10-008 Network+ Training Course, Video 2.3 - Switching Technologies, 12:00 - 14:003

PAT (Port Address Translation) is a type of Network Address Translation (NAT) that allows multiple devices to share a single public IP address by using different port numbers. PAT enables devices to access the internet without exposing their private IP addresses. A router is a device that can perform PAT by translating the source IP address and port number of outgoing packets and the destination IP address and port number of incoming packets. A Layer 3 switch is a device that can perform basic routing functions by using IP addresses, but it cannot perform PAT or other advanced routing features that a router can.