Explain how the router-on-a-stick inter-vlan Consider IPv6 SLAAC. How the duplication Discuss the difference of type 1 hypervisor and How to deal with playback attack in
routing can route traffic between vlans. of GUA is addressed? type 2 hypervisor. SNMP?
• The port of the router-on-a-stick connecting to 1. Randomly Generated GUA: Answer: Answer:
the LAN will have multiple subinterfaces A host generates a Global Unicast Type 1 Hypervisor (Bare Metal Hypervisor): This Using nonce (number used once). The
created, each for one vlan as the default Address (GUA) using SLAAC with a hypervisor runs directly on the physical sender estimates the
gateway. • Traffic from one vlan, say vlan 10, random Interface ID. hardware of the host system. It does not require a receiver’s clock time as the nonce and
destined for a user in another vlan, say vlan 20, 2. Duplicate Address Detection (DAD) separate operating system and has direct include it in the message.
will be forwarded to vlan 10’s default gateway, Process: access to the underlying hardware resources. When the receiver receives the message
which is the subinterface of the router-on-a- Step 1 - Neighbor Solicitation (NS): Type 2 Hypervisor (Hosted Hypervisor): This check the local time with
stick port. • Then it will be routed by the router The host multicasts an ICMPv6 hypervisor runs on top of a conventional the nonce. If the difference is within the
to vlan 20’s default gateway, which is the Neighbor Solicitation (NS) message operating system, such as Windows, Linux, or acceptable range, the
subinterface for vlan 20. Then forwarded to the with the last 24 bits of the IPv6 macOS. message is not outdated.
user in vlan 20. address to check for address Type 1 hypervisor is more efficient as it can access
duplication. the hardware directly, and more
Explain why STP is needed for ethernet LAN with redundancy
Step 2 - Neighbor Advertisement (NA): secure. But it is more difficult to implement, and
1. Endless Looping:
Redundant links in Ethernet LANs can create network A neighboring node responds to the needs management console.
loops, causing endless frame circulation and potential NS message with an ICMPv6 Type 2 hypervisor is less efficient and less secure,
broadcast storms. Neighbor Advertisement (NA) compared to type 1, but easier to
STP prevents network loops by calculating a loop-free
topology and blocking redundant links, ensuring stable message if it detects address install and manage.
network operation. duplication. Type 1 Hypervisor: It is typically deployed on
2. Unstable Forwarding Table: Step 3 - Address Regeneration: servers or data centers where virtualization is
Changes in network topology due to failures or
Upon receiving an NA message the primary use case. Examples of Type 1
configuration updates can lead to frequent forwarding
table modifications. indicating address duplication, the hypervisors include VMware vSphere/ESXi,
STP maintains a stable forwarding table by host regenerates a new Interface ID Microsoft Hyper-V Server, and Kernel-based
dynamically adjusting the network topology and to create a new unique GUA. Virtual Machine (KVM).
updating optimal paths for reliable connectivity.
3. Broadcast Storming: Step 4 - Address Confirmation: Type 2 Hypervisor: It is commonly used on desktop
Redundant links and loops can cause broadcast If no NA message is received, the or laptop computers for development,
storms, consuming bandwidth and degrading network host confirms the GUA is unique and testing, or running multiple operating systems
performance. Why trap mode is needed in SNMP p
configures the network interface simultaneously. Examples of Type 2
STP mitigates broadcast storms by controlling frame Answer:
forwarding and ensuring frames are forwarded along with the new GUA for network hypervisors include VMware Workstation, Oracle
For emergency, when the device age
active and optimal paths, improving network communication. VirtualBox, and Parallels Desktop.
efficiency and stability. contact managing entity immediate
cannot wait to be polled.
Explain how a user obtains an IP address via DHCP. Explain how FHRP improves the gateway How low latency queueing can reduce the delay?
1. DHCP Server Implementation: Trap mode allows network devices, s
reliability. Answer:
A DHCP server is required to allocate and manage IP routers, switches, and servers, to se
addresses for network devices. Answer: A virtual gateway is implemented, with LLQ allows network administrators to define
notifications, called traps, to SNMP
2. DHCP IP Address Allocation Steps: multiple actual routers supporting it. A actual priority queues for specific types of traffic,
Step 1 - DHCP Discover: These traps inform managers about
router is such as voice or video streaming, which require low
The user broadcasts a DHCP discover message on the events, conditions, or errors that oc
local network to request an IP address. chosen as the active router, responsible for the latency. By prioritizing these queues over others,
device, such as link status changes,
Step 2 - DHCP Offer: implementing all gateway functions, and another packets belonging to critical applications are
The DHCP server responds with a DHCP offer message, router as standby router. All traffic is directed to processed interface errors, CPU utilization thre
either unicast or broadcast, offering an available IP exceeded, or system reboots. This e
address to the user.
virtual router interface, and then forwarded to the and transmitted without delay, minimizing latency
proactive monitoring and troublesh
Step 3 - DHCP Request: active router for processing. When the active for
network issues.
The user broadcasts a DHCP request message to the router time-sensitive traffic.
DHCP server, confirming the request for the offered IP Unlike SNMP queries, which are initi
fails, the standby router takes over the Assign the highest priority for the low latency
address. SNMP manager to retrieve informat
Step 4 - DHCP Acknowledge (ACK): responsibility. queue. When the server is available, the traffic in
devices,
The DHCP server sends a DHCP acknowledge message, All traffic sent to the virtual router interface are the
traps are sent asynchronously by de
either unicast or broadcast, allocating the requested IP now low latency queue will be served first. This ensures
address to the user. any explicit request from the manag
Explain briefly about ARP poisoning attack and mitigation. redirected to the standby router. The users are that delay-sensitive traffic is given immediate
asynchronous operation ensures tha
Answer:
not attention
routing can route traffic between vlans. of GUA is addressed? type 2 hypervisor. SNMP?
• The port of the router-on-a-stick connecting to 1. Randomly Generated GUA: Answer: Answer:
the LAN will have multiple subinterfaces A host generates a Global Unicast Type 1 Hypervisor (Bare Metal Hypervisor): This Using nonce (number used once). The
created, each for one vlan as the default Address (GUA) using SLAAC with a hypervisor runs directly on the physical sender estimates the
gateway. • Traffic from one vlan, say vlan 10, random Interface ID. hardware of the host system. It does not require a receiver’s clock time as the nonce and
destined for a user in another vlan, say vlan 20, 2. Duplicate Address Detection (DAD) separate operating system and has direct include it in the message.
will be forwarded to vlan 10’s default gateway, Process: access to the underlying hardware resources. When the receiver receives the message
which is the subinterface of the router-on-a- Step 1 - Neighbor Solicitation (NS): Type 2 Hypervisor (Hosted Hypervisor): This check the local time with
stick port. • Then it will be routed by the router The host multicasts an ICMPv6 hypervisor runs on top of a conventional the nonce. If the difference is within the
to vlan 20’s default gateway, which is the Neighbor Solicitation (NS) message operating system, such as Windows, Linux, or acceptable range, the
subinterface for vlan 20. Then forwarded to the with the last 24 bits of the IPv6 macOS. message is not outdated.
user in vlan 20. address to check for address Type 1 hypervisor is more efficient as it can access
duplication. the hardware directly, and more
Explain why STP is needed for ethernet LAN with redundancy
Step 2 - Neighbor Advertisement (NA): secure. But it is more difficult to implement, and
1. Endless Looping:
Redundant links in Ethernet LANs can create network A neighboring node responds to the needs management console.
loops, causing endless frame circulation and potential NS message with an ICMPv6 Type 2 hypervisor is less efficient and less secure,
broadcast storms. Neighbor Advertisement (NA) compared to type 1, but easier to
STP prevents network loops by calculating a loop-free
topology and blocking redundant links, ensuring stable message if it detects address install and manage.
network operation. duplication. Type 1 Hypervisor: It is typically deployed on
2. Unstable Forwarding Table: Step 3 - Address Regeneration: servers or data centers where virtualization is
Changes in network topology due to failures or
Upon receiving an NA message the primary use case. Examples of Type 1
configuration updates can lead to frequent forwarding
table modifications. indicating address duplication, the hypervisors include VMware vSphere/ESXi,
STP maintains a stable forwarding table by host regenerates a new Interface ID Microsoft Hyper-V Server, and Kernel-based
dynamically adjusting the network topology and to create a new unique GUA. Virtual Machine (KVM).
updating optimal paths for reliable connectivity.
3. Broadcast Storming: Step 4 - Address Confirmation: Type 2 Hypervisor: It is commonly used on desktop
Redundant links and loops can cause broadcast If no NA message is received, the or laptop computers for development,
storms, consuming bandwidth and degrading network host confirms the GUA is unique and testing, or running multiple operating systems
performance. Why trap mode is needed in SNMP p
configures the network interface simultaneously. Examples of Type 2
STP mitigates broadcast storms by controlling frame Answer:
forwarding and ensuring frames are forwarded along with the new GUA for network hypervisors include VMware Workstation, Oracle
For emergency, when the device age
active and optimal paths, improving network communication. VirtualBox, and Parallels Desktop.
efficiency and stability. contact managing entity immediate
cannot wait to be polled.
Explain how a user obtains an IP address via DHCP. Explain how FHRP improves the gateway How low latency queueing can reduce the delay?
1. DHCP Server Implementation: Trap mode allows network devices, s
reliability. Answer:
A DHCP server is required to allocate and manage IP routers, switches, and servers, to se
addresses for network devices. Answer: A virtual gateway is implemented, with LLQ allows network administrators to define
notifications, called traps, to SNMP
2. DHCP IP Address Allocation Steps: multiple actual routers supporting it. A actual priority queues for specific types of traffic,
Step 1 - DHCP Discover: These traps inform managers about
router is such as voice or video streaming, which require low
The user broadcasts a DHCP discover message on the events, conditions, or errors that oc
local network to request an IP address. chosen as the active router, responsible for the latency. By prioritizing these queues over others,
device, such as link status changes,
Step 2 - DHCP Offer: implementing all gateway functions, and another packets belonging to critical applications are
The DHCP server responds with a DHCP offer message, router as standby router. All traffic is directed to processed interface errors, CPU utilization thre
either unicast or broadcast, offering an available IP exceeded, or system reboots. This e
address to the user.
virtual router interface, and then forwarded to the and transmitted without delay, minimizing latency
proactive monitoring and troublesh
Step 3 - DHCP Request: active router for processing. When the active for
network issues.
The user broadcasts a DHCP request message to the router time-sensitive traffic.
DHCP server, confirming the request for the offered IP Unlike SNMP queries, which are initi
fails, the standby router takes over the Assign the highest priority for the low latency
address. SNMP manager to retrieve informat
Step 4 - DHCP Acknowledge (ACK): responsibility. queue. When the server is available, the traffic in
devices,
The DHCP server sends a DHCP acknowledge message, All traffic sent to the virtual router interface are the
traps are sent asynchronously by de
either unicast or broadcast, allocating the requested IP now low latency queue will be served first. This ensures
address to the user. any explicit request from the manag
Explain briefly about ARP poisoning attack and mitigation. redirected to the standby router. The users are that delay-sensitive traffic is given immediate
asynchronous operation ensures tha
Answer:
not attention
