PYTHON-5781 Coverage increase for `network_layer.py` #4502

Job	Run time
Build wheels for win32	5m 0s
Build wheels for manylinux_aarch64	11m 41s
Build wheels for win_arm64	6m 41s
Build wheels for manylinux_x86_64	2m 12s
Build wheels for manylinux_ppc64le	12m 33s
Build wheels for macos	3m 33s
Build wheels for manylinux_s390x	14m 10s
Build wheels for win_amd6	4m 9s
Make SDist	39s
Build wheels for manylinux_i686	3m 1s
Download Wheels	11s
	1h 3m 50s

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