attacks – bots and scanners – DDoS attacks A regular virtual machineIt's a VM. Classic EC2 instance in de‐ fault setting. Resources: EC2SecurityGroup: Type: AWS:: EC2:: SecurityGroup Properties: IpProtocol: -1 As you can see here, we have regular CloudFormation setup, which many of de‐ velopers just produce. In 4 words - "it is not good" So that's the story about secured SSH server install fail2ban – change SSH port. Use for example 31 – lock password login – enable regular firewall – disable default users – root – ubuntu – ec2-user – use security groups or equivalent 3-tier

industry stan- dard to allow operating systems to recognize hardware, configure motherboards and other de- vices and manage power. As all modern PCs contain this feature and Windows and Linux have been supporting some of its settings, use VBoxManage controlvm; see chapter 8.13, VBoxManage controlvm, page 147 for de- tails. 8.2 Commands overview When running VBoxManage without parameters or when supplying an invalid (hostonly), or access rarely used sub-modes (generic). These options correspond to the modes which are de- scribed in detail in chapter 6.2, Introduction to networking modes, page 97. • --nictype<1-N> Am7

industry stan- dard to allow operating systems to recognize hardware, configure motherboards and other de- vices and manage power. As all modern PCs contain this feature and Windows and Linux have been supporting some of its settings, use VBoxManage controlvm; see chapter 8.13, VBoxManage controlvm, page 147 for de- tails. 8.2 Commands overview When running VBoxManage without parameters or when supplying an invalid (hostonly), or access rarely used sub-modes (generic). These options correspond to the modes which are de- scribed in detail in chapter 6.2, Introduction to networking modes, page 97. • --nictype<1-N> Am7

industry stan- dard to allow operating systems to recognize hardware, configure motherboards and other de- vices and manage power. As all modern PCs contain this feature and Windows and Linux have been supporting some of its settings, use VBoxManage controlvm; see chapter 8.12, VBoxManage controlvm, page 124 for de- tails. 8.2 Commands overview When running VBoxManage without parameters or when supplying an invalid NAT, page 157 for details). • --nataliasmode<1-N> default|[log],[proxyonly],[sameports]: This option de- fines behaviour of NAT engine core: log - enables logging, proxyonly - switches of aliasing mode makes

industry stan- dard to allow operating systems to recognize hardware, configure motherboards and other de- vices and manage power. As all modern PCs contain this feature and Windows and Linux have been supporting some of its settings, use VBoxManage controlvm; see chapter 8.13, VBoxManage controlvm, page 129 for de- tails. 8.2 Commands overview When running VBoxManage without parameters or when supplying an invalid NAT, page 167 for details). • --nataliasmode<1-N> default|[log],[proxyonly],[sameports]: This option de- fines behaviour of NAT engine core: log - enables logging, proxyonly - switches of aliasing mode makes

industry stan- dard to allow operating systems to recognize hardware, configure motherboards and other de- vices and manage power. As all modern PCs contain this feature and Windows and Linux have been supporting some of its settings, use VBoxManage controlvm; see chapter 8.13, VBoxManage controlvm, page 135 for de- tails. 8.2 Commands overview When running VBoxManage without parameters or when supplying an invalid details). 129 8 VBoxManage • --nataliasmode<1-N> default|[log],[proxyonly],[sameports]: This option de- fines behaviour of NAT engine core: log - enables logging, proxyonly - switches of aliasing mode makes

elsize(::Type{<:A}) Return the stride between consecutive elements in the array. Optional methods De- fault defini- tion Brief description stride(A, i::Int) strides(A)[i] Return the distance in necessary. For simple functions, it is often clearer to mention the role of the arguments directly in the de- scription of the function's purpose. An argument list would only repeat information already provided StackTrace can be used in place of Vector{StackFrame}. (Examples with [...] indicate that output may vary de- pending on how the code is run.) julia> example() = stacktrace() example (generic function with

elsize(::Type{<:A}) Return the stride between consecutive elements in the array. Optional methods De- fault defini- tion Brief description stride(A, i::Int) strides(A)[i] Return the distance in necessary. For simple functions, it is often clearer to mention the role of the arguments directly in the de- scription of the function's purpose. An argument list would only repeat information already provided StackTrace can be used in place of Vector{StackFrame}. (Examples with [...] indicate that output may vary de- pending on how the code is run.) julia> example() = stacktrace() example (generic function with

you should always define at least one of Base.IteratorSize(IterType) and length(iter) because the de- fault definition of Base.IteratorSize(IterType) is Base.HasLength(). Sequential iteration is implemented while next !== nothing 199CHAPTER 16. INTERFACES 200 Method When should this method be defined? De- fault defi- nition Brief description Base.IteratorSize(IterType) If default is not appropriate elsize(::Type{<:A}) Return the stride between consecutive elements in the array. Optional methods De- fault defini- tion Brief description stride(A, i::Int) strides(A)[i] Return the distance in

you should always define at least one of Base.IteratorSize(IterType) and length(iter) because the de- fault definition of Base.IteratorSize(IterType) is Base.HasLength(). Sequential iteration is implemented while next !== nothing 199CHAPTER 16. INTERFACES 200 Method When should this method be defined? De- fault defi- nition Brief description Base.IteratorSize(IterType) If default is not appropriate elsize(::Type{<:A}) Return the stride between consecutive elements in the array. Optional methods De- fault defini- tion Brief description stride(A, i::Int) strides(A)[i] Return the distance in