PYTHON-5781 Coverage increase for `network_layer.py` #3948

Job	Run time
Make SDist	35s
Build wheels for manylinux_i686	2m 22s
Build wheels for manylinux_s390x	14m 51s
Build wheels for manylinux_aarch64	14m 41s
Build wheels for manylinux_x86_64	2m 10s
Build wheels for win32	5m 1s
Build wheels for manylinux_ppc64le	14m 15s
Build wheels for macos	3m 56s
Build wheels for win_amd6	4m 9s
Build wheels for win_arm64	5m 58s
Download Wheels	9s
	1h 8m 7s

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