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GCP > GCP Networkng > Flashcards

GCP Networkng Flashcards

1
Q

How can I monitor the traffic on the VPC network to see where packets are coming from?

A

Enabling flow logs.

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2
Q

What is the largest network space you can have in a GC VPC?

A

/8

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3
Q

Will the CloudFirewall block traffic between instances in the same network?

A

Yes as the FW rules are applied at the instance level. and at the virtual network level.

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4
Q

Will the CloudFirewall block traffic coming into the network?

A

Yes as the firewall rules are applied at the virtual network and instance level.

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5
Q

When you create a GCP network (VPC), will this network (VPC) span more then a single region?

A

Yes, when you create a network (VPC), it spans every region.

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6
Q

Is a GCP network (VPC) able to span projects?

A

No

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7
Q

What is an external IP?

A

It is an IP address available externally and is assigned to the instances network interface.

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8
Q

By default the external IP address is ephemeral, what dose this mean?

A

It means the external IP address is given an public IP from the GCP global IP pool and this IP is put back in the pool once the instance is rebooted.

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9
Q

I have an external IP that is ephemeral when I stop and start my instance, is the external IP returned to the GCP global pool and do i get a new one on restart?

A

Yes, the address is returned to the pool and you get a new one once the VM is restarted.

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10
Q

What are the two different types of static IP you can reserve?

A

regional for assigning to a instance and global that can be assigned to a load balancer.

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11
Q

When I create firewall rule, can I apply the rule to the entire VPC (global network) ?

A

Yes, the rule will span the entire global VPC network.

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12
Q

When I create firewall rule, can I apply the rule to a group of instances?

A

Yes, you can match the rule based on tags

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13
Q

Is network load balancing regional or global?

A

The network load balancer is regional or multi-region.

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14
Q

What are the two types of IP addresses in GCP?

A

Static and ephemeral

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15
Q

An instance can only use a static IP that has been reserved in the same?

A

Region

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16
Q

What is cloud interconnect?

A

It refers to the 3 options to connect you on-prem to GC.

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17
Q

What options do you have to connect from on-prem to GCP.

A

Cloud VPN
Peering
Dedicated interconnect

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18
Q

What is Dedicated interconnect?

A

you connect with google’s network at a colocation, this is an expensive option but supports upto 80 GBper sec, a single link is 10GB at a cost of 1700 per month.

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19
Q

I need 50GB bandwidth to google, what is my best option?

A

Dedicated interconect, this is where you connect to a colocation, colocation has a CP peering edge.

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20
Q

With Dedicated interconnect, do you pay egress fees?

A

Yes, but at a discount, upto 50%

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21
Q

With Dedicated interconenct can I have it connect to my VPC or Google over all for say G-Suit?

A

Direct interconnect only supports connecting to a VPC.

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22
Q

What is Peering?

A

Peering connects you with google network so you can call the google API and services.

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23
Q

Will peering connect to the internet

A

No

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24
Q

What is the peering speed?

A

10GB

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25
Q

What speed is supported by cloud VPN?

A

1.5GB

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26
Q

When using CloudVPN, what options do I have to make it faster?

A

Use a second VPN

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27
Q

For CloudVPN what is the protocal?

A

IPSEC

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28
Q

For CloudVPN what key exchange is suported?

A

IKE1v1 and IKEv2

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29
Q

With CloudVPN, is client to site supported?

A

No

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30
Q

With CloudVPN is dynamic routs supported?

A

Yes use CloudRouter

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31
Q

For CloudVPN what is the SLA?

A

99.9%

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32
Q

Is a VPC a global or regional resource?

A

Global

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33
Q

Is a subnet a regional or global resource?

A

Regional

34
Q

Is a subnet a a zone bound resource?

A

No it spans zones within a region.

35
Q

Is it possible to share a VPC between projects?

A

Yes

36
Q

Is there a instance limit on a VPC?

A

Yes 7000 instances, you can use a second VPC.

37
Q

In a VPC can I use unicast or broadcast traffic?

A

No.

38
Q

Can I convert manual addressing to automatic?

A

No you can only go from auto to manual

39
Q

is IpPvs supported?

A

no, but ipv6 can be used to reach the LB for resources in the network, this also include the LB for app engine.

40
Q

what are network tags?

A

The primary method of segmenting traffic for instances.

41
Q

Is the firewall regional or attached to the global VPC?

A

Attached to the global VPC, this mean when you setup a firewall rule you attached it to a VPC and it is global.

42
Q

Do you define firewall rules at the subnet or instance level?

A

Both instance and subnet level

43
Q

Is all ingress traffic denied by default?

A

Yes

44
Q

Is all egress traffic denied by default?

A

No

45
Q

Are firewall rules prioritized?

A

Yes, rules are evaluated lowest number first.

46
Q

When you create a VPC what default firewall rules do you get when the VPC is using automatic subnet mode creation?

A
  • allow-icmp 65534
  • allow-internal 65534
  • allow-rdp 65534
  • allow-ssh 65534
  • deny-all-ingres 65535
  • allow-all-egress 65535
47
Q

Are all default rules asigned a low or high priority number?

A

Most all rules get 65K at top end, http and https get 1K at ko end.

48
Q

When you create a VPC with two subnets, can VM 1 in subnet 1 ping VM 2 in subnet 2?

A

Yes, by default you get a default firewall rule to enable traffic that is local between subnets.

49
Q

What is a router?

A

It defines where a packet is sent once it leaves the VM?

50
Q

How would i take two VM and route all traffic to a proxy?

A

Define a route with a tag and asigne the tag to the VM’s

51
Q

For routes what are my next hop options

A
  • default internet gateway
  • VPN tunnel
  • IP
  • Instance
52
Q

Are routes global?

A

Yes, they are attached to a VPC (global)

53
Q

What is a host project?

A

I refers to a project that will host a VPC for other projects.

54
Q

What is a service project?

A

It refers to a project that is using a host project VP.

55
Q

What is a standalone project?

A

It is a project that is not using a shared VPC

56
Q

Can I share a hosted projects outside the orgnization?

A

No

57
Q

Can i link a service project with many host projects?

A

No only one host project.

58
Q

Van a project be both a service and host project?

A

No

59
Q

When I create a VPC subnet, is the subnet tied to a zone?

A

No it is independent of the zone, when you deploy an instance, it is at this time you defne in what zone the instance and disk will live.

60
Q

I created a VPC with auto subnet mode, I have two subnets with an instance in each, will I be able to ping without adding a firewall rule?

A

Yes, the following rules are created,

  • allow-icmp 65534
  • allow-internal 65534
  • allow-rdp 65534
  • allow-ssh 65534
  • deny-all-ingres 65535
  • allow-all-egress 65535
61
Q

I created a VPC with custom subnet mode, I have two subnets with an instance in each, will I be able to ping without adding a firewall rule?

A

No, no firewall rules are created.

62
Q

What is a custom subnet?

A

Where you create the subnet and manually enter the required firewall rules.

63
Q

When you create a VPC what default routes do you get?

A
  • Default gateway

- A rule to any subnets you create as part of the VPC

64
Q

What are the filters you can use on a firewall rule?

A
  • Source port
  • Dest port
  • Source address
  • Dest address
  • Portocal
65
Q

How can you group instances so the firewall rule sis applied, is it a label?

A

No, it is a tag, tags are used for networking.

66
Q

I have two VPC and I want to connect both, what options do I have?

A
  • CloudVPN

- VPC Peering

67
Q

I have GKE and I want to connect its network to another VPV, what is my best option?

A

VPC peering can be used for this.

68
Q

I have App engine flexible and I want to connect its network to another VPV, what is my best option?

A

VPC peering can be used for this.

69
Q

For VPC peering can i have overlapping subnet ranges?

A

No

70
Q

I have a number of firewall rules and I wnat to see how they effect traffic, how cna i do this?

A

Use firewall logging.

71
Q

I ahve firewall logging turned on, where can I send the logs?

A

Stackdriver
pub/sub
BigQuery

72
Q

I have an external IP that is ephemeral when I reboot my instance, is the external IP returned to the GCP global pool and do I get a new one on restart?

A

The IP is not given back to the pool.

73
Q

I have a network load balancer and instances are not receiving traffic, what would I need to do?

A

Open firewall for the health check from specific ports found in network LB documentation.

74
Q

What protocols are supported by the network load balancer?

A

SSL proxy and TCP

75
Q

Has the network load balancer got sessionAfinity feature?

A

Yes, off by default.

76
Q

What is the Network loadbalancer?

A

It is an L4 LB supporting SSL proxy and TCP, it is single or multi-region.

77
Q

What is the google load balancer?

A

It is an L7 LB and supports only multi-region and HTTP and HTTP(S).

78
Q

Is the network load balancer, internal or external facing?

A

Both, internal between instances and external to receive traffic from the internet.

79
Q

Is the GCP load balancer global?

A

Global, unlike AWS, the load balancer is a global load balancer receiving traffic and distributing it to one or more regional globally

80
Q

Can you use the GCP load balancer for internal VM?

A

No, it is an internet only facing LB

GCP (30 decks)

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